| Value | Category | Cases | |
|---|---|---|---|
| 1960 | 1960 and before | 9 | 
                                                                 
                                    
                                    10.3%
                                 
                                                             | 
                                                        
                    
| 1961 | 13 | 
                                                                 
                                    
                                    14.9%
                                 
                                                             | 
                                                        
                    |
| 1962 | 11 | 
                                                                 
                                    
                                    12.6%
                                 
                                                             | 
                                                        
                    |
| 1963 | 4 | 
                                                                 
                                    
                                    4.6%
                                 
                                                             | 
                                                        
                    |
| 1964 | 1 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 1966 | 1 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 1970 | 1 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 1971 | 2 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 1972 | 1 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 1973 | 2 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 1974 | 1 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 1975 | 1 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 1976 | 1 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 1977 | 10 | 
                                                                 
                                    
                                    11.5%
                                 
                                                             | 
                                                        
                    |
| 1978 | 5 | 
                                                                 
                                    
                                    5.7%
                                 
                                                             | 
                                                        
                    |
| 1979 | 2 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 1981 | 2 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 1983 | 1 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 1985 | 2 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 1989 | 3 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    |
| 1990 | 1 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 1991 | 2 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 2002 | 1 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 2009 | 1 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 2010 | 1 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 2013 | 3 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    |
| 2014 | 3 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    |
| 2016 | 1 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 9998 | 1 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 1564 |