| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 89 |
4.5%
|
|
| 2005 | 200 |
10%
|
|
| 2006 | 350 |
17.5%
|
|
| 2007 | 581 |
29.1%
|
|
| 2008 | 705 |
35.3%
|
|
| 2009 | 47 |
2.4%
|
|
| 9997 | Inconsistent | 24 |
1.2%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 6448 |