| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 7 |
0.1%
|
|
| 2009 | 916 |
11.9%
|
|
| 2010 | 1342 |
17.5%
|
|
| 2011 | 1585 |
20.6%
|
|
| 2012 | 1820 |
23.7%
|
|
| 2013 | 1918 |
25%
|
|
| 2014 | 88 |
1.1%
|
|
| 9997 | Inconsistent | 2 |
0%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 41529 |