75% (1968)

80% (1960)

77% (1964)

71% (1952)

70% (1995)

69% (1999)

68% (1975)

54% (2010)

48% (1972)

68% (1955)

56% (1972)

69% (1970)

49% (1979)

67% (2004)

63% (1999)

68% (1962)

63% (1972)

60% (1973)

70% (2003)

50% (2005)