| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
0%
|
|
| 2001 | 77 |
1.8%
|
|
| 2002 | 341 |
8.1%
|
|
| 2003 | 575 |
13.7%
|
|
| 2004 | 847 |
20.1%
|
|
| 2005 | 1588 |
37.8%
|
|
| 2006 | 470 |
11.2%
|
|
| 9998 | 1 |
0%
|
|
| 9999 | Missing | 306 |
7.3%
|
| Sysmiss | 18306 |