| Value | Category | Cases | |
|---|---|---|---|
| 2009 | 1 |
2.5%
|
|
| 2010 | 5 |
12.5%
|
|
| 2011 | 14 |
35%
|
|
| 2012 | 17 |
42.5%
|
|
| 2013 | 3 |
7.5%
|
|
| Sysmiss | 10 |