| Value | Category | Cases | |
|---|---|---|---|
| 2012 | 18 |
0.4%
|
|
| 2013 | 1062 |
24.7%
|
|
| 2014 | 1689 |
39.2%
|
|
| 2015 | 1517 |
35.2%
|
|
| 2016 | 18 |
0.4%
|
|
| 9997 | Inconsistent | 1 |
0%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 32864 |