| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 1 |
0.3%
|
|
| 2001 | 1 |
0.3%
|
|
| 2002 | 1 |
0.3%
|
|
| 2004 | 3 |
1%
|
|
| 2006 | 3 |
1%
|
|
| 2007 | 5 |
1.7%
|
|
| 2008 | 11 |
3.7%
|
|
| 2009 | 14 |
4.7%
|
|
| 2010 | 30 |
10.1%
|
|
| 2011 | 84 |
28.2%
|
|
| 2012 | 94 |
31.5%
|
|
| 2013 | 51 |
17.1%
|
|
| Sysmiss | 602 |