| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 170 |
6.3%
|
|
| 2004 | 429 |
15.9%
|
|
| 2005 | 541 |
20.1%
|
|
| 2006 | 649 |
24.1%
|
|
| 2007 | 781 |
29%
|
|
| 2008 | 126 |
4.7%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 15725 |