| Value | Category | Cases | |
|---|---|---|---|
| 1950 | 4 |
0.1%
|
|
| 1951 | 5 |
0.1%
|
|
| 1952 | 22 |
0.4%
|
|
| 1953 | 8 |
0.2%
|
|
| 1954 | 14 |
0.3%
|
|
| 1955 | 22 |
0.4%
|
|
| 1956 | 10 |
0.2%
|
|
| 1957 | 20 |
0.4%
|
|
| 1958 | 23 |
0.5%
|
|
| 1959 | 20 |
0.4%
|
|
| 1960 | 65 |
1.3%
|
|
| 1961 | 42 |
0.9%
|
|
| 1962 | 27 |
0.6%
|
|
| 1963 | 26 |
0.5%
|
|
| 1964 | 58 |
1.2%
|
|
| 1965 | 45 |
0.9%
|
|
| 1966 | 26 |
0.5%
|
|
| 1967 | 34 |
0.7%
|
|
| 1968 | 32 |
0.7%
|
|
| 1969 | 38 |
0.8%
|
|
| 1970 | 58 |
1.2%
|
|
| 1971 | 52 |
1.1%
|
|
| 1972 | 43 |
0.9%
|
|
| 1973 | 41 |
0.8%
|
|
| 1974 | 52 |
1.1%
|
|
| 1975 | 58 |
1.2%
|
|
| 1976 | 49 |
1%
|
|
| 1977 | 61 |
1.2%
|
|
| 1978 | 49 |
1%
|
|
| 1979 | 49 |
1%
|
|
| 1980 | 76 |
1.5%
|
|
| 1981 | 54 |
1.1%
|
|
| 1982 | 89 |
1.8%
|
|
| 1983 | 67 |
1.4%
|
|
| 1984 | 73 |
1.5%
|
|
| 1985 | 32 |
0.7%
|
|
| 9997 | Missing | 572 |
11.7%
|
| 9999 | Don't know | 2890 |
58.9%
|