73% (1973)

57% (1974)

65% (1976)

50% (1974)

52% (1971)

54% (1967)

54% (1968)

64% (1971)

45% (1970)

63% (1980)

68% (1979)

67% (1986)

50% (1970)

32% (1972)

52% (1975)

53% (1970)

59% (1979)

58% (1969)

39% (1969)

46% (1980)