| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 127 |
17.3%
|
|
| 2005 | 253 |
34.5%
|
|
| 2006 | 212 |
28.9%
|
|
| 2007 | 105 |
14.3%
|
|
| 2008 | 21 |
2.9%
|
|
| 2009 | 1 |
0.1%
|
|
| 9997 | Inconsistent | 15 |
2%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 7710 |