| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 3 |
1.1%
|
|
| 2003 | 1 |
0.4%
|
|
| 2005 | 1 |
0.4%
|
|
| 2007 | 2 |
0.7%
|
|
| 2008 | 3 |
1.1%
|
|
| 2009 | 5 |
1.8%
|
|
| 2010 | 3 |
1.1%
|
|
| 2011 | 43 |
15.1%
|
|
| 2012 | 102 |
35.9%
|
|
| 2013 | 91 |
32%
|
|
| 2014 | 8 |
2.8%
|
|
| 9998 | don't know | 22 |
7.7%
|
| Sysmiss | 16146 |