| Value | Category | Cases | |
|---|---|---|---|
| 2012 | 98 |
3.3%
|
|
| 2013 | 800 |
26.6%
|
|
| 2014 | 1140 |
37.9%
|
|
| 2015 | 955 |
31.8%
|
|
| 2016 | 7 |
0.2%
|
|
| 9997 | Inconsistent | 4 |
0.1%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 34165 |