| value | category | cases | |
|---|---|---|---|
| 2006 | 230 |
3.4%
|
|
| 2007 | 946 |
14.1%
|
|
| 2008 | 1173 |
17.4%
|
|
| 2009 | 1378 |
20.5%
|
|
| 2010 | 1809 |
26.9%
|
|
| 2011 | 1187 |
17.7%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | don't know | 0 |
0%
|
| 10001 | .Z | 31261 |