| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 2 |
4.7%
|
|
| 2006 | 23 |
53.5%
|
|
| 2007 | 14 |
32.6%
|
|
| 2008 | 2 |
4.7%
|
|
| 2009 | 1 |
2.3%
|
|
| 9997 | inconsistent | 1 |
2.3%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 18711 |