| Value | Category | Cases | |
|---|---|---|---|
| 2009 | 6 |
6%
|
|
| 2010 | 12 |
12%
|
|
| 2011 | 22 |
22%
|
|
| 2012 | 24 |
24%
|
|
| 2013 | 34 |
34%
|
|
| 2014 | 2 |
2%
|
|
| Sysmiss | .don't know | 0 | |
| Sysmiss | .qre refused | 0 | |
| Sysmiss | .refusal | 0 | |
| Sysmiss | .skip | 0 | |
| Sysmiss | .x. censored | 0 | |
| Sysmiss | 1334 |