| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 17 |
0.8%
|
|
| 2004 | 339 |
15.1%
|
|
| 2005 | 459 |
20.5%
|
|
| 2006 | 518 |
23.1%
|
|
| 2007 | 779 |
34.8%
|
|
| 2008 | 129 |
5.8%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 16180 |