| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 52 |
1.1%
|
|
| 2006 | 668 |
14%
|
|
| 2007 | 880 |
18.5%
|
|
| 2008 | 1013 |
21.3%
|
|
| 2009 | 1146 |
24.1%
|
|
| 2010 | 983 |
20.7%
|
|
| 9997 | inconsistent | 16 |
0.3%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 3474 |