71% (1972)

75% (2005)

69% (1967)

61% (1970)

76% (2001)

70% (1994)

70% (1976)

68% (1968)

73% (1962)

77% (1969)

73% (1999)

68% (1979)

62% (1975)

68% (1977)

68% (1966)

59% (1972)

60% (1979)

63% (1963)

60% (1984)

66% (1969)