| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 1 |
0.6%
|
|
| 2005 | 2 |
1.3%
|
|
| 2007 | 7 |
4.5%
|
|
| 2008 | 8 |
5.2%
|
|
| 2009 | 6 |
3.9%
|
|
| 2010 | 14 |
9.1%
|
|
| 2011 | 14 |
9.1%
|
|
| 2012 | 47 |
30.5%
|
|
| 2013 | 40 |
26%
|
|
| 2014 | 15 |
9.7%
|
|
| Sysmiss | 1700 |