| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 13 |
4.1%
|
|
| 2005 | 26 |
8.2%
|
|
| 2006 | 28 |
8.8%
|
|
| 2007 | 62 |
19.4%
|
|
| 2008 | 183 |
57.4%
|
|
| 2009 | 7 |
2.2%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 8738 |