63% (1993)

62% (1974)

70% (1986)

56% (1994)

63% (1967)

68% (1952)

68% (1984)

63% (1975)

62% (1985)

74% (1987)

59% (1978)

55% (1959)

62% (1980)

73% (1990)

72% (1958)

65% (1948)

65% (1968)

67% (1984)

57% (1983)

48% (1982)