67% (1975)

70% (1982)

81% (1979)

73% (1977)

70% (1980)

60% (1984)

59% (1976)

72% (1982)

67% (1983)

79% (1980)

50% (1982)

73% (1987)

47% (1975)

45% (1980)

77% (1980)

70% (1981)

36% (1989)

52% (1981)

27% (1984)

78% (1980)