81% (1979)

82% (1986)

70% (1979)

63% (1981)

77% (1987)

72% (1976)

63% (1986)

70% (1988)

62% (1982)

67% (1974)

80% (1982)

60% (1974)

66% (1978)

64% (1980)

60% (1977)

50% (1989)

70% (1980)

10% (1988)

67% (1988)

67% (1976)