| value | category | cases | |
|---|---|---|---|
| 2006 | 238 |
3.6%
|
|
| 2007 | 982 |
14.7%
|
|
| 2008 | 1177 |
17.6%
|
|
| 2009 | 1359 |
20.3%
|
|
| 2010 | 1774 |
26.6%
|
|
| 2011 | 1151 |
17.2%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | don't know | 0 |
0%
|
| 10001 | .Z | 31303 |