| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 53 |
1.3%
|
|
| 2006 | 404 |
9.7%
|
|
| 2007 | 642 |
15.4%
|
|
| 2008 | 899 |
21.6%
|
|
| 2009 | 1176 |
28.2%
|
|
| 2010 | 979 |
23.5%
|
|
| 9997 | inconsistent | 12 |
0.3%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 14589 |