| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 106 |
4.8%
|
|
| 2005 | 222 |
10%
|
|
| 2006 | 395 |
17.8%
|
|
| 2007 | 620 |
28%
|
|
| 2008 | 798 |
36%
|
|
| 2009 | 53 |
2.4%
|
|
| 9997 | Inconsistent | 23 |
1%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 6227 |