| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 2 |
3.5%
|
|
| 2006 | 10 |
17.5%
|
|
| 2007 | 8 |
14%
|
|
| 2008 | 15 |
26.3%
|
|
| 2009 | 10 |
17.5%
|
|
| 2010 | 12 |
21.1%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| Sysmiss | 347 |