| Value | Category | Cases | |
|---|---|---|---|
| 2012 | 2 |
0.1%
|
|
| 2013 | 868 |
22.6%
|
|
| 2014 | 1515 |
39.4%
|
|
| 2015 | 1436 |
37.4%
|
|
| 2016 | 19 |
0.5%
|
|
| 9997 | Inconsistent | 2 |
0.1%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 33327 |