| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
0.4%
|
|
| 2001 | 99 |
43.6%
|
|
| 2002 | 78 |
34.4%
|
|
| 2003 | 33 |
14.5%
|
|
| 2004 | 14 |
6.2%
|
|
| 2005 | 2 |
0.9%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 29845 |