| Value | Category | Cases | |
|---|---|---|---|
| 99 | Don't Know | 0 | 
                                    
                                    0%
                                 | 
| 1999 | 1 | 
                                    
                                    0.3%
                                 | |
| 2000 | 6 | 
                                    
                                    1.8%
                                 | |
| 2001 | 75 | 
                                    
                                    22.5%
                                 | |
| 2002 | 120 | 
                                    
                                    35.9%
                                 | |
| 2003 | 104 | 
                                    
                                    31.1%
                                 | |
| 2004 | 28 | 
                                    
                                    8.4%
                                 | |
| Sysmiss | 1222 |