| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 1 |
0.6%
|
|
| 2000 | 17 |
10.8%
|
|
| 2001 | 18 |
11.4%
|
|
| 2002 | 36 |
22.8%
|
|
| 2003 | 60 |
38%
|
|
| 2004 | 26 |
16.5%
|