| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 2 |
16.7%
|
|
| 2005 | 1 |
8.3%
|
|
| 2006 | 1 |
8.3%
|
|
| 2007 | 2 |
16.7%
|
|
| 2008 | 6 |
50%
|
|
| DON'T KNOW | 2 | ||
| MISSING | 4 | ||
| NOT APPLICABLE | 934 |