| value | category | cases | |
|---|---|---|---|
| 2007 | 390 |
7.5%
|
|
| 2008 | 983 |
18.8%
|
|
| 2009 | 1246 |
23.8%
|
|
| 2010 | 1454 |
27.8%
|
|
| 2011 | 1160 |
22.2%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | don't know | 0 |
0%
|
| 10001 | .Z | 32751 |