| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 1 |
0.6%
|
|
| 2003 | 1 |
0.6%
|
|
| 2004 | 3 |
1.9%
|
|
| 2005 | 5 |
3.1%
|
|
| 2007 | 1 |
0.6%
|
|
| 2008 | 2 |
1.3%
|
|
| 2009 | 9 |
5.7%
|
|
| 2010 | 6 |
3.8%
|
|
| 2011 | 15 |
9.4%
|
|
| 2012 | 20 |
12.6%
|
|
| 2013 | 24 |
15.1%
|
|
| 2014 | 32 |
20.1%
|
|
| 2015 | 11 |
6.9%
|
|
| 3333 | Missing | 0 |
0%
|
| 5555 | Not applicable | 0 |
0%
|
| 8888 | Refused | 1 |
0.6%
|
| 9999 | Don't know | 28 |
17.6%
|
| Sysmiss | 13759 |