Value | Category | Cases | |
---|---|---|---|
99 | Don’t Know | 0 |
0%
|
1962 | 2 |
0.5%
|
|
1964 | 4 |
1.1%
|
|
1966 | 1 |
0.3%
|
|
1968 | 6 |
1.6%
|
|
1969 | 3 |
0.8%
|
|
1970 | 5 |
1.4%
|
|
1971 | 5 |
1.4%
|
|
1972 | 6 |
1.6%
|
|
1973 | 8 |
2.2%
|
|
1974 | 7 |
1.9%
|
|
1975 | 10 |
2.7%
|
|
1976 | 13 |
3.5%
|
|
1977 | 8 |
2.2%
|
|
1978 | 18 |
4.9%
|
|
1979 | 9 |
2.5%
|
|
1980 | 21 |
5.7%
|
|
1981 | 13 |
3.5%
|
|
1982 | 29 |
7.9%
|
|
1983 | 30 |
8.2%
|
|
1984 | 34 |
9.3%
|
|
1985 | 28 |
7.6%
|
|
1986 | 35 |
9.5%
|
|
1987 | 56 |
15.3%
|
|
1988 | 16 |
4.4%
|