| Value | Category | Cases | |
|---|---|---|---|
| -99 | Do not know | 3 |
12%
|
| 1980 | 1 |
4%
|
|
| 1986 | 1 |
4%
|
|
| 2000 | 1 |
4%
|
|
| 2002 | 1 |
4%
|
|
| 2007 | 2 |
8%
|
|
| 2008 | 3 |
12%
|
|
| 2009 | 2 |
8%
|
|
| 2010 | 4 |
16%
|
|
| 2013 | 3 |
12%
|
|
| 2014 | 1 |
4%
|
|
| 2015 | 2 |
8%
|
|
| 2017 | 1 |
4%
|
|
| Sysmiss | 103 |