| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 294 |
9.9%
|
|
| 2004 | 448 |
15%
|
|
| 2005 | 554 |
18.6%
|
|
| 2006 | 753 |
25.3%
|
|
| 2007 | 790 |
26.5%
|
|
| 2008 | 141 |
4.7%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 15441 |