| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 15 |
0.3%
|
|
| 2006 | 610 |
13.5%
|
|
| 2007 | 843 |
18.7%
|
|
| 2008 | 968 |
21.5%
|
|
| 2009 | 1100 |
24.4%
|
|
| 2010 | 954 |
21.2%
|
|
| 9997 | inconsistent | 15 |
0.3%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 3727 |