72% (1931)

68% (1992)

70% (1977)

65% (1995)

57% (2006)

62% (2011)

66% (2006)

66% (2000)

65% (2003)

64% (2002)

62% (1977)

65% (2012)

66% (2002)

77% (1999)

71% (1989)

64% (2003)

72% (2019)

59% (2010)

69% (2017)

64% (2012)