67% (1975)

81% (1979)

70% (1982)

60% (1984)

70% (1980)

73% (1977)

50% (1982)

45% (1980)

59% (1976)

79% (1980)

0% (1978)

67% (1983)

72% (1982)

77% (1980)

78% (1980)

63% (1984)

75% (1980)

81% (1981)

27% (1984)

70% (1981)