| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 35 |
0.9%
|
|
| 2009 | 553 |
14%
|
|
| 2010 | 622 |
15.8%
|
|
| 2011 | 868 |
22%
|
|
| 2012 | 887 |
22.5%
|
|
| 2013 | 944 |
23.9%
|
|
| 2014 | 38 |
1%
|
|
| 9997 | Inconsistent | 2 |
0.1%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 45258 |