72% (1976)

84% (1975)

77% (1983)

66% (1970)

10% (1984)

83% (1980)

68% (1983)

74% (1984)

0% (1970)

70% (1983)

45% (1979)

59% (1985)

41% (1977)

73% (1986)

80% (1977)

10% (1989)

50% (1976)

81% (1974)

74% (1980)

60% (1978)