| value | category | cases | |
|---|---|---|---|
| 2006 | 22 |
0.4%
|
|
| 2007 | 732 |
12.5%
|
|
| 2008 | 1061 |
18.2%
|
|
| 2009 | 1348 |
23.1%
|
|
| 2010 | 1511 |
25.9%
|
|
| 2011 | 1168 |
20%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | don't know | 0 |
0%
|
| 10001 | .Z | 32142 |