| Value | Category | Cases | |
|---|---|---|---|
| -2 | Refusal to answer | 3 |
0.3%
|
| -1 | Don't know | 35 |
3.8%
|
| 1900 | 1 |
0.1%
|
|
| 1920 | 2 |
0.2%
|
|
| 1924 | 1 |
0.1%
|
|
| 1938 | 1 |
0.1%
|
|
| 1942 | 3 |
0.3%
|
|
| 1945 | 1 |
0.1%
|
|
| 1946 | 1 |
0.1%
|
|
| 1947 | 1 |
0.1%
|
|
| 1950 | 6 |
0.6%
|
|
| 1952 | 1 |
0.1%
|
|
| 1955 | 1 |
0.1%
|
|
| 1956 | 4 |
0.4%
|
|
| 1958 | 2 |
0.2%
|
|
| 1959 | 1 |
0.1%
|
|
| 1960 | 3 |
0.3%
|
|
| 1962 | 2 |
0.2%
|
|
| 1964 | 3 |
0.3%
|
|
| 1965 | 2 |
0.2%
|
|
| 1966 | 3 |
0.3%
|
|
| 1967 | 1 |
0.1%
|
|
| 1969 | 1 |
0.1%
|
|
| 1970 | 12 |
1.3%
|
|
| 1971 | 3 |
0.3%
|
|
| 1972 | 6 |
0.6%
|
|
| 1974 | 4 |
0.4%
|
|
| 1975 | 13 |
1.4%
|
|
| 1976 | 1 |
0.1%
|
|
| 1977 | 2 |
0.2%
|
|
| 1978 | 8 |
0.9%
|
|
| 1979 | 3 |
0.3%
|
|
| 1980 | 16 |
1.7%
|
|
| 1981 | 7 |
0.8%
|
|
| 1982 | 11 |
1.2%
|
|
| 1983 | 3 |
0.3%
|
|
| 1984 | 5 |
0.5%
|
|
| 1985 | 17 |
1.8%
|
|
| 1986 | 19 |
2.1%
|
|
| 1987 | 14 |
1.5%
|
|
| 1988 | 10 |
1.1%
|
|
| 1989 | 17 |
1.8%
|
|
| 1990 | 44 |
4.8%
|
|
| 1991 | 30 |
3.2%
|
|
| 1992 | 41 |
4.4%
|
|
| 1993 | 50 |
5.4%
|
|
| 1994 | 54 |
5.8%
|
|
| 1995 | 85 |
9.2%
|
|
| 1996 | 65 |
7%
|
|
| 1997 | 67 |
7.3%
|
|
| 1998 | 88 |
9.5%
|
|
| 1999 | 69 |
7.5%
|
|
| 2000 | 72 |
7.8%
|
|
| 2001 | 9 |
1%
|
|
| Sysmiss | 8 |