| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 1 |
9.1%
|
|
| 2007 | 2 |
18.2%
|
|
| 2008 | 1 |
9.1%
|
|
| 2012 | 3 |
27.3%
|
|
| 2014 | 2 |
18.2%
|
|
| 2015 | 2 |
18.2%
|
|
| 9998 | don't know | 0 |
0%
|
| Sysmiss | 11748 |