| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 253 |
8.7%
|
|
| 2004 | 439 |
15.2%
|
|
| 2005 | 563 |
19.4%
|
|
| 2006 | 723 |
25%
|
|
| 2007 | 791 |
27.3%
|
|
| 2008 | 127 |
4.4%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 15525 |