64% (1975)

73% (1987)

75% (1980)

62% (1983)

50% (1984)

45% (1973)

73% (1985)

78% (1981)

70% (1981)

70% (1978)

80% (1981)

60% (1988)

50% (1979)

70% (1984)

70% (1975)

68% (1975)

40% (1987)

67% (1989)

81% (1981)

70% (1982)