77% (1964)

74% (1968)

80% (1960)

71% (1952)

80% (1992)

73% (1959)

70% (1995)

63% (1972)

70% (1999)

70% (2003)

69% (1970)

83% (1977)

67% (2004)

80% (2000)

68% (1962)

63% (1999)

49% (1979)

56% (1972)

0% (1966)

53% (2010)