| Value | Category | Cases | |
|---|---|---|---|
| 1986 | 1 |
1.3%
|
|
| 1989 | 1 |
1.3%
|
|
| 1990 | 2 |
2.7%
|
|
| 1992 | 1 |
1.3%
|
|
| 1994 | 1 |
1.3%
|
|
| 1995 | 6 |
8%
|
|
| 1996 | 2 |
2.7%
|
|
| 1998 | 1 |
1.3%
|
|
| 2000 | 10 |
13.3%
|
|
| 2001 | 5 |
6.7%
|
|
| 2002 | 2 |
2.7%
|
|
| 2003 | 1 |
1.3%
|
|
| 2004 | 5 |
6.7%
|
|
| 2005 | 5 |
6.7%
|
|
| 2006 | 7 |
9.3%
|
|
| 2007 | 6 |
8%
|
|
| 2008 | 3 |
4%
|
|
| 2009 | 2 |
2.7%
|
|
| 2010 | 7 |
9.3%
|
|
| 2011 | 2 |
2.7%
|
|
| 2012 | 3 |
4%
|
|
| 2013 | 2 |
2.7%
|