| Value | Category | Cases | |
|---|---|---|---|
| 1951 | 1 |
0.1%
|
|
| 1953 | 4 |
0.6%
|
|
| 1954 | 1 |
0.1%
|
|
| 1955 | 1 |
0.1%
|
|
| 1957 | 3 |
0.4%
|
|
| 1958 | 1 |
0.1%
|
|
| 1959 | 2 |
0.3%
|
|
| 1961 | 1 |
0.1%
|
|
| 1962 | 2 |
0.3%
|
|
| 1964 | 2 |
0.3%
|
|
| 1965 | 1 |
0.1%
|
|
| 1966 | 3 |
0.4%
|
|
| 1967 | 4 |
0.6%
|
|
| 1968 | 4 |
0.6%
|
|
| 1969 | 5 |
0.7%
|
|
| 1970 | 10 |
1.5%
|
|
| 1971 | 3 |
0.4%
|
|
| 1972 | 12 |
1.8%
|
|
| 1973 | 4 |
0.6%
|
|
| 1974 | 8 |
1.2%
|
|
| 1975 | 8 |
1.2%
|
|
| 1976 | 18 |
2.7%
|
|
| 1977 | 7 |
1%
|
|
| 1978 | 18 |
2.7%
|
|
| 1979 | 13 |
1.9%
|
|
| 1980 | 29 |
4.3%
|
|
| 1981 | 6 |
0.9%
|
|
| 1982 | 13 |
1.9%
|
|
| 1983 | 14 |
2.1%
|
|
| 1984 | 20 |
3%
|
|
| 1985 | 15 |
2.2%
|
|
| 1986 | 17 |
2.5%
|
|
| 1987 | 10 |
1.5%
|
|
| 1988 | 13 |
1.9%
|
|
| 1989 | 9 |
1.3%
|
|
| 1990 | 8 |
1.2%
|
|
| 1991 | 8 |
1.2%
|
|
| 1992 | 10 |
1.5%
|
|
| 1993 | 6 |
0.9%
|
|
| 1994 | 6 |
0.9%
|
|
| 1995 | 6 |
0.9%
|
|
| 1996 | 4 |
0.6%
|
|
| 1997 | 1 |
0.1%
|
|
| 1998 | 2 |
0.3%
|
|
| 3333 | Missing | 4 |
0.6%
|
| 5555 | Not applicable | 0 |
0%
|
| 8888 | Refused | 0 |
0%
|
| 9999 | Don't know | 336 |
49.9%
|
| Sysmiss | 326 |