| Value | Category | Cases | |
|---|---|---|---|
| 2009 | 14 |
1.6%
|
|
| 2010 | 53 |
6.1%
|
|
| 2011 | 63 |
7.2%
|
|
| 2012 | 113 |
12.9%
|
|
| 2013 | 295 |
33.8%
|
|
| 2014 | 336 |
38.4%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 35556 |