| Value | Category | Cases | |
|---|---|---|---|
| 1 | EachMonth | 44 | 
                                                                 
                                    
                                    21.8%
                                 
                                                             | 
                                                        
                    
| 2 | EachQuarter | 72 | 
                                                                 
                                    
                                    35.6%
                                 
                                                             | 
                                                        
                    
| 3 | EachSixMos | 41 | 
                                                                 
                                    
                                    20.3%
                                 
                                                             | 
                                                        
                    
| 4 | EachYear | 45 | 
                                                                 
                                    
                                    22.3%
                                 
                                                             | 
                                                        
                    
| Missing value | 2006 |