79% (1980)

63% (1988)

64% (1980)

78% (1973)

77% (1985)

86% (1979)

35% (1968)

81% (1980)

82% (1985)

80% (1982)

73% (1969)

90% (1986)

67% (1982)

60% (1980)

80% (1984)

77% (1990)

80% (1983)

63% (1977)

63% (1990)

64% (1983)