| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 |
15.8%
|
| 1930 | 1 |
2.6%
|
|
| 1946 | 1 |
2.6%
|
|
| 1947 | 1 |
2.6%
|
|
| 1960 | 1 |
2.6%
|
|
| 1985 | 1 |
2.6%
|
|
| 1986 | 1 |
2.6%
|
|
| 1990 | 2 |
5.3%
|
|
| 1993 | 2 |
5.3%
|
|
| 1994 | 1 |
2.6%
|
|
| 2000 | 4 |
10.5%
|
|
| 2001 | 1 |
2.6%
|
|
| 2003 | 2 |
5.3%
|
|
| 2005 | 1 |
2.6%
|
|
| 2006 | 1 |
2.6%
|
|
| 2008 | 3 |
7.9%
|
|
| 2009 | 1 |
2.6%
|
|
| 2011 | 1 |
2.6%
|
|
| 2012 | 1 |
2.6%
|
|
| 2014 | 4 |
10.5%
|
|
| 2016 | 1 |
2.6%
|
|
| 2017 | 1 |
2.6%
|
|
| Sysmiss | 202 |