| Value | Category | Cases | |
|---|---|---|---|
| 1989 | 1 |
1%
|
|
| 1998 | 1 |
1%
|
|
| 1999 | 2 |
1.9%
|
|
| 2000 | 16 |
15.4%
|
|
| 2001 | 11 |
10.6%
|
|
| 2002 | 15 |
14.4%
|
|
| 2003 | 33 |
31.7%
|
|
| 2004 | 25 |
24%
|