| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
0%
|
|
| 2001 | 59 |
1.5%
|
|
| 2002 | 292 |
7.5%
|
|
| 2003 | 524 |
13.5%
|
|
| 2004 | 761 |
19.6%
|
|
| 2005 | 1375 |
35.4%
|
|
| 2006 | 464 |
12%
|
|
| 9998 | 4 |
0.1%
|
|
| 9999 | Missing | 399 |
10.3%
|
| Sysmiss | 18633 |