| Value | Category | Cases | |
|---|---|---|---|
| 1 | Do not know | 1118 |
45.3%
|
| 1962 | 4 |
0.2%
|
|
| 1966 | 2 |
0.1%
|
|
| 1968 | 5 |
0.2%
|
|
| 1970 | 9 |
0.4%
|
|
| 1975 | 1 |
0%
|
|
| 1980 | 56 |
2.3%
|
|
| 1981 | 5 |
0.2%
|
|
| 1982 | 12 |
0.5%
|
|
| 1983 | 11 |
0.4%
|
|
| 1984 | 2 |
0.1%
|
|
| 1985 | 10 |
0.4%
|
|
| 1986 | 9 |
0.4%
|
|
| 1987 | 11 |
0.4%
|
|
| 1988 | 3 |
0.1%
|
|
| 1989 | 12 |
0.5%
|
|
| 1990 | 25 |
1%
|
|
| 1991 | 4 |
0.2%
|
|
| 1992 | 4 |
0.2%
|
|
| 1993 | 7 |
0.3%
|
|
| 1995 | 26 |
1.1%
|
|
| 1996 | 8 |
0.3%
|
|
| 1997 | 11 |
0.4%
|
|
| 1998 | 24 |
1%
|
|
| 1999 | 23 |
0.9%
|
|
| 2000 | 18 |
0.7%
|
|
| 2001 | 8 |
0.3%
|
|
| 2002 | 34 |
1.4%
|
|
| 2003 | 13 |
0.5%
|
|
| 2004 | 29 |
1.2%
|
|
| 2005 | 13 |
0.5%
|
|
| 2006 | 32 |
1.3%
|
|
| 2007 | 101 |
4.1%
|
|
| 2008 | 92 |
3.7%
|
|
| 2009 | 107 |
4.3%
|
|
| 2010 | 170 |
6.9%
|
|
| 2011 | 120 |
4.9%
|
|
| 2012 | 88 |
3.6%
|
|
| 2013 | 127 |
5.1%
|
|
| 2014 | 113 |
4.6%
|
|
| Sysmiss | 13860 |