| Value | Category | Cases | |
|---|---|---|---|
| 1992 | 30 |
10%
|
|
| 1993 | 10 |
3.3%
|
|
| 1994 | 5 |
1.7%
|
|
| 1995 | 17 |
5.7%
|
|
| 1996 | 11 |
3.7%
|
|
| 1997 | 18 |
6%
|
|
| 1998 | 23 |
7.7%
|
|
| 1999 | 25 |
8.4%
|
|
| 2000 | 52 |
17.4%
|
|
| 2001 | 31 |
10.4%
|
|
| 2002 | 22 |
7.4%
|
|
| 2003 | 25 |
8.4%
|
|
| 2004 | 12 |
4%
|
|
| 2005 | 7 |
2.3%
|
|
| 2006 | 5 |
1.7%
|
|
| 2007 | 2 |
0.7%
|
|
| 2008 | 1 |
0.3%
|
|
| 2011 | 1 |
0.3%
|
|
| Missing value | 2 |
0.7%
|