71% (1982)

60% (1983)

70% (1993)

66% (1980)

58% (1972)

61% (1986)

66% (1978)

70% (1976)

65% (1967)

78% (1987)

73% (1967)

72% (1981)

64% (1982)

67% (1988)

68% (1986)

68% (1977)

54% (1975)

55% (1969)

56% (1973)

61% (1979)