76% (1977)

70% (1987)

60% (1982)

62% (1988)

62% (1958)

62% (1974)

69% (1985)

70% (1965)

63% (1967)

70% (1976)

58% (1973)

48% (1956)

59% (1987)

68% (1954)

64% (1987)

69% (1969)

62% (1968)

60% (1979)

0% (1961)

49% (1966)