| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 21 |
0.5%
|
|
| 2006 | 364 |
9.3%
|
|
| 2007 | 583 |
14.9%
|
|
| 2008 | 860 |
21.9%
|
|
| 2009 | 1108 |
28.2%
|
|
| 2010 | 975 |
24.9%
|
|
| 9997 | inconsistent | 12 |
0.3%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 14831 |