| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 |
1%
|
|
| 2001 | 1 |
1%
|
|
| 2002 | 5 |
4.9%
|
|
| 2003 | 3 |
2.9%
|
|
| 2004 | 9 |
8.7%
|
|
| 2005 | 7 |
6.8%
|
|
| 2006 | 56 |
54.4%
|
|
| 2007 | 21 |
20.4%
|