71% (1971)

66% (1974)

78% (1973)

63% (1988)

35% (1968)

66% (1968)

80% (1969)

75% (1962)

82% (1985)

59% (1985)

69% (1984)

75% (1977)

73% (1979)

41% (1977)

64% (1980)

77% (1985)

83% (1975)

78% (1980)

67% (1979)

63% (1974)