| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 126 |
5.3%
|
|
| 2005 | 222 |
9.3%
|
|
| 2006 | 430 |
18%
|
|
| 2007 | 643 |
27%
|
|
| 2008 | 899 |
37.7%
|
|
| 2009 | 43 |
1.8%
|
|
| 9997 | Inconsistent | 22 |
0.9%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 6059 |