| Value | Category | Cases | |
|---|---|---|---|
| 2012 | 7 |
0.2%
|
|
| 2013 | 967 |
23.8%
|
|
| 2014 | 1601 |
39.4%
|
|
| 2015 | 1473 |
36.2%
|
|
| 2016 | 20 |
0.5%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 33101 |