| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 270 |
9.7%
|
|
| 2004 | 416 |
15%
|
|
| 2005 | 513 |
18.5%
|
|
| 2006 | 703 |
25.3%
|
|
| 2007 | 741 |
26.7%
|
|
| 2008 | 132 |
4.8%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 15646 |