64% (1975)

73% (1987)

73% (1978)

70% (1978)

63% (1984)

68% (1981)

78% (1981)

70% (1977)

37% (1976)

55% (1977)

63% (1987)

40% (1987)

80% (1979)

75% (1980)

75% (1984)

45% (1973)

70% (1975)

65% (1984)

70% (1981)

64% (1987)