| Value | Category | Cases | |
|---|---|---|---|
| -99 | Do not know | 2 |
11.8%
|
| 1987 | 1 |
5.9%
|
|
| 1995 | 1 |
5.9%
|
|
| 1996 | 1 |
5.9%
|
|
| 2002 | 1 |
5.9%
|
|
| 2006 | 3 |
17.6%
|
|
| 2007 | 2 |
11.8%
|
|
| 2008 | 3 |
17.6%
|
|
| 2009 | 1 |
5.9%
|
|
| 2014 | 1 |
5.9%
|
|
| 2016 | 1 |
5.9%
|
|
| Sysmiss | 111 |