| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 2 |
1%
|
|
| 2004 | 6 |
2.9%
|
|
| 2005 | 22 |
10.5%
|
|
| 2006 | 37 |
17.7%
|
|
| 2007 | 137 |
65.6%
|
|
| 2008 | 5 |
2.4%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 18212 |