35% (1968)

80% (1980)

78% (1973)

64% (1980)

81% (1980)

77% (1985)

82% (1985)

63% (1977)

70% (1978)

86% (1979)

90% (1986)

80% (1983)

73% (1969)

63% (1990)

60% (1980)

80% (1982)

64% (1983)

80% (1984)

67% (1982)

60% (1984)