67% (1972)

75% (1980)

50% (1983)

59% (1982)

70% (1975)

63% (1982)

67% (1978)

50% (1983)

67% (1982)

45% (1985)

64% (1974)

64% (1983)

20% (1973)

57% (1976)

70% (1977)

62% (1976)

40% (1983)

83% (1977)

45% (1981)

67% (1984)