75% (1980)

67% (1972)

57% (1976)

82% (1976)

64% (1983)

74% (1985)

57% (1986)

45% (1979)

67% (1982)

50% (1983)

40% (1983)

80% (1977)

70% (1977)

67% (1984)

65% (1975)

50% (1983)

57% (1976)

70% (1975)

45% (1981)

63% (1982)