67% (1972)

82% (1976)

57% (1976)

64% (1983)

74% (1985)

50% (1983)

63% (1982)

75% (1980)

63% (1982)

67% (1978)

40% (1983)

70% (1977)

45% (1981)

67% (1984)

57% (1974)

62% (1976)

57% (1976)

80% (1977)

55% (1982)

45% (1979)