| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 10 |
0.3%
|
|
| 2006 | 318 |
8.6%
|
|
| 2007 | 559 |
15.1%
|
|
| 2008 | 799 |
21.6%
|
|
| 2009 | 1056 |
28.6%
|
|
| 2010 | 944 |
25.5%
|
|
| 9997 | inconsistent | 11 |
0.3%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 15057 |