69% (1993)

64% (1987)

60% (1954)

67% (1973)

61% (2008)

57% (1983)

57% (2001)

63% (1986)

68% (1968)

68% (1965)

54% (2013)

65% (1988)

68% (1975)

64% (1974)

57% (1980)

72% (1950)

66% (1946)

61% (1953)

49% (2009)

59% (1952)