| Value | Category | Cases | |
|---|---|---|---|
| 2011 | 4 |
0.4%
|
|
| 2012 | 97 |
9.7%
|
|
| 2013 | 562 |
56.5%
|
|
| 2014 | 332 |
33.4%
|
|
| Sysmiss | 1569 |