| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 28 |
0.4%
|
|
| 2008 | 184 |
2.6%
|
|
| 2009 | 460 |
6.6%
|
|
| 2010 | 545 |
7.8%
|
|
| 2011 | 665 |
9.5%
|
|
| 2012 | 698 |
10%
|
|
| 2013 | 733 |
10.5%
|
|
| 2014 | 842 |
12.1%
|
|
| 2015 | 884 |
12.7%
|
|
| 2016 | 913 |
13.1%
|
|
| 2017 | 7 |
0.1%
|
|
| 3333 | Missing | 40 |
0.6%
|
| 5555 | Not applicable | 0 |
0%
|
| 8888 | Refused | 1 |
0%
|
| 9999 | Don't know | 985 |
14.1%
|
| Sysmiss | 8008 |