32% (1968)

38% (1977)

46% (1969)

33% (1973)

0% (1976)

50% (1962)

48% (1978)

77% (1981)

40% (1975)

39% (1965)

47% (1969)

40% (1971)

48% (1970)

29% (1985)

0% (1963)

50% (1973)

40% (1971)

10% (1970)

71% (1961)

60% (1964)