80% (1979)

65% (1984)

60% (1989)

70% (1978)

62% (1983)

62% (1980)

68% (1975)

37% (1976)

70% (1981)

65% (1982)

72% (1987)

73% (1983)

63% (1984)

48% (1979)

67% (1983)

40% (1987)

70% (1984)

58% (1973)

67% (1989)

75% (1984)