| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 1 |
1.8%
|
|
| 2003 | 3 |
5.5%
|
|
| 2004 | 6 |
10.9%
|
|
| 2005 | 11 |
20%
|
|
| 2006 | 18 |
32.7%
|
|
| 2007 | 15 |
27.3%
|
|
| 8888 | 1 |
1.8%
|