67% (1972)

75% (1980)

57% (1986)

80% (1977)

64% (1983)

57% (1976)

82% (1976)

67% (1984)

67% (1982)

63% (1982)

50% (1983)

70% (1977)

40% (1983)

40% (1985)

45% (1985)

64% (1974)

74% (1985)

57% (1974)

62% (1976)

45% (1984)