| Value | Category | Cases | |
|---|---|---|---|
| 97 | Refused | 0 |
0%
|
| 98 | Don't know | 5 |
0.3%
|
| 99 | Missing | 46 |
2.7%
|
| 1953 | 1 |
0.1%
|
|
| 1960 | 6 |
0.3%
|
|
| 1964 | 4 |
0.2%
|
|
| 1965 | 2 |
0.1%
|
|
| 1968 | 1 |
0.1%
|
|
| 1969 | 1 |
0.1%
|
|
| 1970 | 2 |
0.1%
|
|
| 1972 | 5 |
0.3%
|
|
| 1973 | 2 |
0.1%
|
|
| 1974 | 2 |
0.1%
|
|
| 1975 | 4 |
0.2%
|
|
| 1976 | 1 |
0.1%
|
|
| 1977 | 3 |
0.2%
|
|
| 1978 | 2 |
0.1%
|
|
| 1980 | 16 |
0.9%
|
|
| 1981 | 1 |
0.1%
|
|
| 1982 | 12 |
0.7%
|
|
| 1983 | 4 |
0.2%
|
|
| 1984 | 11 |
0.6%
|
|
| 1985 | 7 |
0.4%
|
|
| 1986 | 9 |
0.5%
|
|
| 1987 | 7 |
0.4%
|
|
| 1988 | 9 |
0.5%
|
|
| 1989 | 9 |
0.5%
|
|
| 1990 | 21 |
1.2%
|
|
| 1991 | 30 |
1.7%
|
|
| 1992 | 20 |
1.2%
|
|
| 1993 | 22 |
1.3%
|
|
| 1994 | 26 |
1.5%
|
|
| 1995 | 21 |
1.2%
|
|
| 1996 | 18 |
1%
|
|
| 1997 | 11 |
0.6%
|
|
| 1998 | 35 |
2%
|
|
| 1999 | 45 |
2.6%
|
|
| 2000 | 108 |
6.3%
|
|
| 2001 | 59 |
3.4%
|
|
| 2002 | 67 |
3.9%
|
|
| 2003 | 74 |
4.3%
|
|
| 2004 | 64 |
3.7%
|
|
| 2005 | 71 |
4.1%
|
|
| 2006 | 62 |
3.6%
|
|
| 2007 | 57 |
3.3%
|
|
| 2008 | 97 |
5.6%
|
|
| 2009 | 116 |
6.7%
|
|
| 2010 | 154 |
8.9%
|
|
| 2011 | 124 |
7.2%
|
|
| 2012 | 196 |
11.4%
|
|
| 2013 | 51 |
3%
|
|
| Sysmiss | 4 |