77% (1964)

74% (1968)

80% (1992)

73% (1952)

80% (1960)

63% (1999)

71% (1999)

70% (2003)

80% (2000)

55% (1973)

70% (1956)

70% (1995)

49% (1979)

62% (1997)

69% (1970)

40% (1973)

67% (2004)

63% (1972)

54% (2010)

0% (1956)