| Value | Category | Cases | |
|---|---|---|---|
| 2011 | 2 |
3.8%
|
|
| 2012 | 37 |
69.8%
|
|
| 2013 | 2 |
3.8%
|
|
| 9999 | NS/NR | 12 |
22.6%
|
| Sysmiss | 1200 |