32% (1968)

46% (1969)

38% (1977)

33% (1973)

48% (1978)

40% (1971)

40% (1975)

50% (1973)

0% (1976)

77% (1981)

39% (1965)

40% (1971)

29% (1985)

0% (1963)

47% (1969)

48% (1970)

53% (1962)

71% (1961)

30% (1975)

20% (1972)