76% (1985)

50% (1984)

77% (1988)

68% (1969)

46% (1990)

53% (1989)

71% (1983)

73% (1985)

57% (1971)

69% (1986)

62% (1971)

61% (1985)

50% (1965)

61% (1980)

50% (1988)

43% (1978)

70% (1972)

55% (1985)

76% (1982)

67% (1987)