| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 23 |
0.3%
|
|
| 2009 | 1076 |
13.3%
|
|
| 2010 | 1400 |
17.3%
|
|
| 2011 | 1658 |
20.5%
|
|
| 2012 | 1876 |
23.2%
|
|
| 2013 | 1952 |
24.2%
|
|
| 2014 | 85 |
1.1%
|
|
| 9997 | Inconsistent | 2 |
0%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 41135 |