68% (2000)

68% (2016)

71% (2014)

69% (1967)

62% (1987)

70% (2017)

67% (2010)

62% (2005)

61% (2005)

63% (1984)

60% (1976)

62% (1998)

61% (1968)

69% (1977)

75% (1943)

69% (1979)

62% (2004)

64% (1975)

63% (1992)

63% (1989)