| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
0%
|
|
| 2001 | 84 |
2%
|
|
| 2002 | 358 |
8.5%
|
|
| 2003 | 592 |
14%
|
|
| 2004 | 868 |
20.5%
|
|
| 2005 | 1580 |
37.4%
|
|
| 2006 | 452 |
10.7%
|
|
| 9998 | 2 |
0%
|
|
| 9999 | Missing | 291 |
6.9%
|
| Sysmiss | 18284 |