| Value | Category | Cases | |
|---|---|---|---|
| 1998 | 1 |
1.2%
|
|
| 2001 | 2 |
2.3%
|
|
| 2003 | 4 |
4.7%
|
|
| 2004 | 4 |
4.7%
|
|
| 2005 | 9 |
10.5%
|
|
| 2006 | 16 |
18.6%
|
|
| 2007 | 16 |
18.6%
|
|
| 2008 | 34 |
39.5%
|
|
| DON'T KNOW | 3 | ||
| MISSING | 5 | ||
| NOT APPLICABLE | 858 |
