| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 1 |
0.4%
|
|
| 2005 | 1 |
0.4%
|
|
| 2007 | 7 |
3.1%
|
|
| 2008 | 86 |
37.6%
|
|
| 2009 | 88 |
38.4%
|
|
| 2010 | 43 |
18.8%
|
|
| 2011 | 3 |
1.3%
|
|
| Sysmiss | 62 |