| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 211 |
7.5%
|
|
| 2004 | 438 |
15.5%
|
|
| 2005 | 555 |
19.7%
|
|
| 2006 | 684 |
24.3%
|
|
| 2007 | 804 |
28.5%
|
|
| 2008 | 127 |
4.5%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 15602 |