| Value | Category | Cases | |
|---|---|---|---|
| 2012 | 24 |
0.5%
|
|
| 2013 | 1093 |
24.9%
|
|
| 2014 | 1712 |
39%
|
|
| 2015 | 1535 |
35%
|
|
| 2016 | 23 |
0.5%
|
|
| 9997 | Inconsistent | 1 |
0%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 32781 |