| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 3 |
20%
|
|
| 2007 | 2 |
13.3%
|
|
| 2009 | 2 |
13.3%
|
|
| 2011 | 2 |
13.3%
|
|
| 2013 | 1 |
6.7%
|
|
| 2014 | 3 |
20%
|
|
| 2015 | 1 |
6.7%
|
|
| 2016 | 1 |
6.7%
|
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 41997 |