| Value | Category | Cases | |
|---|---|---|---|
| 1997 | 1 |
0.3%
|
|
| 1998 | 1 |
0.3%
|
|
| 1999 | 5 |
1.5%
|
|
| 2000 | 10 |
3%
|
|
| 2001 | 8 |
2.4%
|
|
| 2002 | 7 |
2.1%
|
|
| 2003 | 9 |
2.7%
|
|
| 2004 | 18 |
5.4%
|
|
| 2005 | 27 |
8.1%
|
|
| 2006 | 22 |
6.6%
|
|
| 2007 | 25 |
7.5%
|
|
| 2008 | 37 |
11.1%
|
|
| 2009 | 38 |
11.4%
|
|
| 2010 | 42 |
12.6%
|
|
| 2011 | 42 |
12.6%
|
|
| 2012 | 41 |
12.3%
|
|
| Sysmiss | 1206 |