| Value | Category | Cases | |
|---|---|---|---|
| 2009 | 37 |
0.8%
|
|
| 2010 | 151 |
3.3%
|
|
| 2011 | 785 |
17.2%
|
|
| 2012 | 413 |
9.1%
|
|
| 2013 | 3145 |
68.9%
|
|
| 2014 | 29 |
0.6%
|
|
| 9997 | Inconsistent | 2 |
0%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 44645 |