75% (1980)

64% (1983)

67% (1982)

62% (1976)

57% (1976)

70% (1977)

82% (1976)

65% (1975)

57% (1976)

67% (1972)

80% (1977)

55% (1982)

74% (1985)

50% (1983)

60% (1975)

57% (1986)

63% (1982)

67% (1978)

70% (1975)

40% (1983)