| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 28 |
4.1%
|
|
| 2005 | 207 |
30.6%
|
|
| 2006 | 205 |
30.3%
|
|
| 2007 | 176 |
26%
|
|
| 2008 | 47 |
7%
|
|
| 9997 | Inconsistent | 13 |
1.9%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 7768 |