35% (1968)

78% (1980)

64% (1980)

63% (1988)

90% (1986)

78% (1973)

80% (1980)

80% (1982)

63% (1990)

82% (1985)

73% (1969)

86% (1979)

77% (1985)

60% (1980)

64% (1983)

80% (1984)

63% (1977)

67% (1982)

70% (1978)

60% (1984)