| Value | Category | Cases | |
|---|---|---|---|
| 1992 | 3 |
0.2%
|
|
| 1993 | 9 |
0.5%
|
|
| 1994 | 31 |
1.8%
|
|
| 1995 | 25 |
1.5%
|
|
| 1996 | 21 |
1.2%
|
|
| 1997 | 23 |
1.3%
|
|
| 1998 | 23 |
1.3%
|
|
| 1999 | 40 |
2.3%
|
|
| 2000 | 69 |
4%
|
|
| 2001 | 54 |
3.2%
|
|
| 2002 | 72 |
4.2%
|
|
| 2003 | 70 |
4.1%
|
|
| 2004 | 110 |
6.4%
|
|
| 2005 | 133 |
7.8%
|
|
| 2006 | 166 |
9.7%
|
|
| 2007 | 188 |
11%
|
|
| 2008 | 207 |
12.1%
|
|
| 2009 | 229 |
13.4%
|
|
| 2010 | 141 |
8.2%
|
|
| 2011 | 75 |
4.4%
|
|
| 2012 | 21 |
1.2%
|