68% (1964)

40% (2002)

58% (1957)

70% (1964)

76% (2006)

66% (1961)

60% (1954)

64% (1969)

58% (1956)

90% (1961)

62% (1959)

64% (1968)

70% (2006)

80% (1960)

56% (1956)

39% (2000)

62% (1988)

74% (1939)

62% (1967)

60% (2006)