| Value | Category | Cases | |
|---|---|---|---|
| -999 | 26 |
0.4%
|
|
| 2012 | 26 |
0.4%
|
|
| 2013 | 288 |
4.9%
|
|
| 2014 | 5585 |
94.3%
|
|
| Sysmiss | 3367 |