| Value | Category | Cases | |
|---|---|---|---|
| 1 | Do not know | 1114 |
50.1%
|
| 1970 | 9 |
0.4%
|
|
| 1972 | 2 |
0.1%
|
|
| 1974 | 3 |
0.1%
|
|
| 1975 | 4 |
0.2%
|
|
| 1978 | 4 |
0.2%
|
|
| 1979 | 3 |
0.1%
|
|
| 1980 | 10 |
0.4%
|
|
| 1981 | 1 |
0%
|
|
| 1984 | 5 |
0.2%
|
|
| 1985 | 4 |
0.2%
|
|
| 1986 | 23 |
1%
|
|
| 1987 | 7 |
0.3%
|
|
| 1988 | 8 |
0.4%
|
|
| 1989 | 15 |
0.7%
|
|
| 1990 | 14 |
0.6%
|
|
| 1992 | 21 |
0.9%
|
|
| 1993 | 36 |
1.6%
|
|
| 1994 | 18 |
0.8%
|
|
| 1995 | 19 |
0.9%
|
|
| 1996 | 25 |
1.1%
|
|
| 1997 | 10 |
0.4%
|
|
| 1998 | 31 |
1.4%
|
|
| 1999 | 29 |
1.3%
|
|
| 2000 | 33 |
1.5%
|
|
| 2001 | 16 |
0.7%
|
|
| 2002 | 45 |
2%
|
|
| 2003 | 15 |
0.7%
|
|
| 2004 | 24 |
1.1%
|
|
| 2005 | 19 |
0.9%
|
|
| 2006 | 48 |
2.2%
|
|
| 2007 | 76 |
3.4%
|
|
| 2008 | 59 |
2.7%
|
|
| 2009 | 72 |
3.2%
|
|
| 2010 | 108 |
4.9%
|
|
| 2011 | 146 |
6.6%
|
|
| 2012 | 86 |
3.9%
|
|
| 2013 | 62 |
2.8%
|
|
| Sysmiss | 13104 |