59% (1979)

60% (1972)

56% (1972)

52% (1979)

47% (1978)

72% (1982)

65% (1986)

58% (1981)

72% (1964)

37% (1984)

53% (1980)

32% (1977)

63% (1972)

60% (1969)

59% (1984)

65% (1985)

58% (1985)

64% (1981)

54% (1979)

50% (1971)