66% (1971)

74% (1973)

52% (1976)

56% (1979)

63% (1975)

63% (1955)

67% (1952)

71% (1977)

60% (1995)

59% (1977)

63% (1965)

66% (1960)

68% (1969)

62% (1966)

70% (1967)

54% (1976)

59% (1956)

72% (1981)

56% (1999)

75% (1975)