| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 3 |
0.6%
|
|
| 2008 | 9 |
1.9%
|
|
| 2009 | 40 |
8.6%
|
|
| 2010 | 32 |
6.9%
|
|
| 2011 | 37 |
8%
|
|
| 2012 | 52 |
11.2%
|
|
| 2013 | 45 |
9.7%
|
|
| 2014 | 63 |
13.6%
|
|
| 2015 | 60 |
13%
|
|
| 2016 | 49 |
10.6%
|
|
| 2017 | 1 |
0.2%
|
|
| 3333 | Missing | 0 |
0%
|
| 5555 | Not applicable | 0 |
0%
|
| 8888 | Refused | 0 |
0%
|
| 9999 | Don't know | 72 |
15.6%
|
| Sysmiss | 536 |