| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 6 |
5.2%
|
|
| 2004 | 5 |
4.3%
|
|
| 2005 | 4 |
3.5%
|
|
| 2008 | 5 |
4.3%
|
|
| 2009 | 11 |
9.6%
|
|
| 2010 | 6 |
5.2%
|
|
| 2011 | 7 |
6.1%
|
|
| 2012 | 9 |
7.8%
|
|
| 2013 | 14 |
12.2%
|
|
| 2014 | 7 |
6.1%
|
|
| 9998 | dont know | 41 |
35.7%
|
| Sysmiss | 16315 |