| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 1 |
1.4%
|
|
| 2005 | 1 |
1.4%
|
|
| 2006 | 1 |
1.4%
|
|
| 2007 | 3 |
4.2%
|
|
| 2008 | 32 |
44.4%
|
|
| 2009 | 31 |
43.1%
|
|
| 9998 | Don't Know | 3 |
4.2%
|