| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 4 |
1.2%
|
|
| 2004 | 12 |
3.6%
|
|
| 2005 | 31 |
9.3%
|
|
| 2006 | 40 |
12%
|
|
| 2007 | 221 |
66.2%
|
|
| 2008 | 26 |
7.8%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 18087 |