51% (2002)

26% (1997)

0% (1956)

61% (1955)

64% (1955)

68% (1984)

66% (1972)

65% (1961)

73% (1969)

80% (1990)

71% (1981)

78% (1988)

72% (1992)

84% (1980)

82% (1972)

77% (1975)

50% (1968)

74% (1971)

83% (1973)

70% (1967)