Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 5 |
5%
|
1972 | 1 |
1%
|
|
1975 | 1 |
1%
|
|
1993 | 1 |
1%
|
|
1994 | 2 |
2%
|
|
1995 | 5 |
5%
|
|
1997 | 3 |
3%
|
|
1998 | 2 |
2%
|
|
1999 | 3 |
3%
|
|
2000 | 6 |
6%
|
|
2001 | 3 |
3%
|
|
2002 | 4 |
4%
|
|
2003 | 2 |
2%
|
|
2004 | 5 |
5%
|
|
2005 | 7 |
7%
|
|
2006 | 3 |
3%
|
|
2007 | 4 |
4%
|
|
2008 | 4 |
4%
|
|
2009 | 2 |
2%
|
|
2010 | 6 |
6%
|
|
2011 | 4 |
4%
|
|
2012 | 6 |
6%
|
|
2013 | 5 |
5%
|
|
2014 | 1 |
1%
|
|
2015 | 5 |
5%
|
|
2016 | 5 |
5%
|
|
2017 | 2 |
2%
|
|
2018 | 3 |
3%
|
|
Sysmiss | 260 |