| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 2 |
4.8%
|
|
| 2006 | 23 |
54.8%
|
|
| 2007 | 13 |
31%
|
|
| 2008 | 2 |
4.8%
|
|
| 2009 | 1 |
2.4%
|
|
| 9997 | inconsistent | 1 |
2.4%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 18712 |