| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 1 |
0.7%
|
|
| 1993 | 2 |
1.3%
|
|
| 1994 | 1 |
0.7%
|
|
| 1995 | 1 |
0.7%
|
|
| 1996 | 9 |
6%
|
|
| 1997 | 1 |
0.7%
|
|
| 2000 | 3 |
2%
|
|
| 2002 | 1 |
0.7%
|
|
| 2004 | 2 |
1.3%
|
|
| 2005 | 4 |
2.7%
|
|
| 2006 | 6 |
4%
|
|
| 2007 | 6 |
4%
|
|
| 2008 | 12 |
8.1%
|
|
| 2009 | 13 |
8.7%
|
|
| 2010 | 39 |
26.2%
|
|
| 2011 | 30 |
20.1%
|
|
| 2012 | 18 |
12.1%
|
|
| Sysmiss | 314 |