| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 5 |
12.8%
|
|
| 2005 | 6 |
15.4%
|
|
| 2009 | 2 |
5.1%
|
|
| 2010 | 12 |
30.8%
|
|
| 2013 | 4 |
10.3%
|
|
| 2014 | 6 |
15.4%
|
|
| 2015 | 4 |
10.3%
|
|
| 9998 | don't know | 0 |
0%
|
| Sysmiss | 62554 |