| 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 |