| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 1 |
0.2%
|
|
| 2004 | 159 |
29.6%
|
|
| 2005 | 186 |
34.6%
|
|
| 2006 | 124 |
23%
|
|
| 2007 | 46 |
8.6%
|
|
| 2008 | 7 |
1.3%
|
|
| 9997 | Inconsistent | 15 |
2.8%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 7906 |