77% (1964)

80% (1960)

74% (1968)

80% (1992)

80% (2000)

70% (1999)

71% (1952)

68% (1975)

60% (1973)

70% (2003)

83% (1977)

56% (1972)

69% (1970)

63% (1999)

57% (1974)

0% (1956)

48% (1972)

70% (1995)

50% (1999)

70% (1954)