73% (1987)

37% (1976)

65% (1982)

70% (1981)

65% (1984)

68% (1981)

64% (1975)

70% (1987)

78% (1981)

72% (1987)

50% (1979)

80% (1981)

81% (1981)

70% (1975)

80% (1979)

70% (1978)

63% (1987)

63% (1988)

63% (1974)

75% (1980)