| Value | Category | Cases | |
|---|---|---|---|
| 1997 | 1 |
0.5%
|
|
| 2010 | 4 |
1.9%
|
|
| 2011 | 2 |
0.9%
|
|
| 2012 | 5 |
2.3%
|
|
| 2013 | 51 |
23.9%
|
|
| 2014 | 150 |
70.4%
|
|
| Sysmiss | 220 |