| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 1 |
2.1%
|
|
| 2001 | 3 |
6.3%
|
|
| 2003 | 2 |
4.2%
|
|
| 2004 | 2 |
4.2%
|
|
| 2005 | 3 |
6.3%
|
|
| 2006 | 30 |
62.5%
|
|
| 2007 | 7 |
14.6%
|