| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 106 |
4.8%
|
|
| 2005 | 219 |
9.8%
|
|
| 2006 | 396 |
17.8%
|
|
| 2007 | 605 |
27.2%
|
|
| 2008 | 828 |
37.2%
|
|
| 2009 | 48 |
2.2%
|
|
| 9997 | Inconsistent | 24 |
1.1%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 6218 |