| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 4 |
5.1%
|
|
| 2006 | 19 |
24.4%
|
|
| 2007 | 12 |
15.4%
|
|
| 2008 | 20 |
25.6%
|
|
| 2009 | 13 |
16.7%
|
|
| 2010 | 10 |
12.8%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 831 |