59% (1992)

77% (1949)

59% (2005)

68% (1970)

67% (1995)

67% (1980)

75% (1939)

55% (1993)

52% (1988)

61% (1931)

62% (1980)

68% (1950)

59% (2002)

69% (1993)

70% (2003)

64% (1992)

71% (1960)

68% (2001)

67% (1988)

68% (2014)