| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 18 |
0.4%
|
|
| 2004 | 1101 |
26.8%
|
|
| 2005 | 1052 |
25.6%
|
|
| 2006 | 814 |
19.8%
|
|
| 2007 | 586 |
14.3%
|
|
| 2008 | 514 |
12.5%
|
|
| 2009 | 26 |
0.6%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 4946 |