62% (1980)

73% (1982)

69% (1964)

60% (1970)

68% (1966)

66% (1974)

59% (1983)

55% (1965)

60% (1977)

75% (1979)

56% (1989)

63% (1968)

71% (1974)

73% (1986)

56% (1967)

80% (1973)

74% (1962)

63% (1982)

70% (1956)

73% (1979)