| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 2 |
7.4%
|
|
| 2004 | 2 |
7.4%
|
|
| 2005 | 5 |
18.5%
|
|
| 2006 | 7 |
25.9%
|
|
| 2007 | 11 |
40.7%
|