| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 780 |
5.6%
|
|
| 2004 | 2342 |
16.7%
|
|
| 2005 | 2692 |
19.2%
|
|
| 2006 | 3218 |
22.9%
|
|
| 2007 | 3214 |
22.9%
|
|
| 2008 | 1802 |
12.8%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| 9999 | Missing | 2 |
0%
|
| Sysmiss | 194 |