| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 88 |
4.4%
|
|
| 2005 | 196 |
9.8%
|
|
| 2006 | 349 |
17.5%
|
|
| 2007 | 565 |
28.3%
|
|
| 2008 | 732 |
36.6%
|
|
| 2009 | 46 |
2.3%
|
|
| 9997 | Inconsistent | 24 |
1.2%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 6444 |