68% (1985)

72% (1981)

71% (1967)

61% (1988)

64% (1971)

70% (1968)

56% (1970)

67% (1968)

63% (1972)

70% (1966)

74% (1968)

82% (1979)

75% (1980)

81% (1976)

70% (1968)

73% (1966)

0% (1980)

61% (1992)

83% (1983)

80% (1971)