71% (1982)

82% (1979)

69% (1990)

76% (1988)

70% (1980)

73% (1956)

70% (1989)

63% (1975)

57% (1989)

53% (1973)

57% (1967)

68% (1990)

57% (1963)

61% (1985)

10% (1991)

60% (1983)

65% (1987)

40% (2000)

56% (1969)

57% (1941)