| Value | Category | Cases | |
|---|---|---|---|
| 2011 | 12 |
8.1%
|
|
| 2012 | 86 |
57.7%
|
|
| 2013 | 9 |
6%
|
|
| 9999 | 42 |
28.2%
|
|
| Sysmiss | 31 |