| Value | Category | Cases | |
|---|---|---|---|
| 1988 | 1 |
0.7%
|
|
| 1992 | 1 |
0.7%
|
|
| 1993 | 1 |
0.7%
|
|
| 2000 | 8 |
5.5%
|
|
| 2001 | 2 |
1.4%
|
|
| 2002 | 1 |
0.7%
|
|
| 2003 | 2 |
1.4%
|
|
| 2004 | 5 |
3.4%
|
|
| 2005 | 2 |
1.4%
|
|
| 2006 | 2 |
1.4%
|
|
| 2007 | 5 |
3.4%
|
|
| 2008 | 10 |
6.8%
|
|
| 2009 | 11 |
7.5%
|
|
| 2010 | 41 |
28.1%
|
|
| 2011 | 19 |
13%
|
|
| 2012 | 23 |
15.8%
|
|
| 2013 | 12 |
8.2%
|
|
| Sysmiss | 321 |