| Value | Category | Cases | |
|---|---|---|---|
| 1998 | 1 |
0.3%
|
|
| 1999 | 1 |
0.3%
|
|
| 2000 | 4 |
1.4%
|
|
| 2001 | 2 |
0.7%
|
|
| 2002 | 6 |
2.1%
|
|
| 2003 | 7 |
2.4%
|
|
| 2004 | 9 |
3.1%
|
|
| 2005 | 10 |
3.5%
|
|
| 2006 | 18 |
6.3%
|
|
| 2007 | 18 |
6.3%
|
|
| 2008 | 22 |
7.7%
|
|
| 2009 | 21 |
7.3%
|
|
| 2010 | 26 |
9.1%
|
|
| 2011 | 31 |
10.8%
|
|
| 2012 | 28 |
9.8%
|
|
| 2013 | 27 |
9.4%
|
|
| 2014 | 26 |
9.1%
|
|
| 2015 | 26 |
9.1%
|
|
| 2016 | 4 |
1.4%
|
|
| Sysmiss | 12120 |