| Value | Category | Cases | |
|---|---|---|---|
| 1997 | 1 |
4.5%
|
|
| 1998 | 1 |
4.5%
|
|
| 1999 | 1 |
4.5%
|
|
| 2000 | 13 |
59.1%
|
|
| 2001 | 6 |
27.3%
|