| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 2 |
0.1%
|
|
| 2006 | 269 |
7.9%
|
|
| 2007 | 527 |
15.5%
|
|
| 2008 | 722 |
21.2%
|
|
| 2009 | 996 |
29.3%
|
|
| 2010 | 873 |
25.7%
|
|
| 9997 | inconsistent | 11 |
0.3%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 15354 |