| Value | Category | Cases | |
|---|---|---|---|
| 1998 | 10 |
2.5%
|
|
| 1999 | 48 |
12.1%
|
|
| 2000 | 71 |
17.8%
|
|
| 2001 | 41 |
10.3%
|
|
| 2002 | 62 |
15.6%
|
|
| 2003 | 84 |
21.1%
|
|
| 2004 | 47 |
11.8%
|
|
| 2005 | 27 |
6.8%
|
|
| 2006 | 7 |
1.8%
|
|
| 2007 | 1 |
0.3%
|