76% (1967)

55% (1990)

72% (1961)

63% (2012)

62% (2018)

56% (2003)

54% (1997)

60% (1989)

78% (1932)

73% (1992)

69% (2002)

48% (2007)

64% (2002)

65% (1980)

69% (2007)

50% (1993)

70% (2005)

64% (1997)

54% (1985)

66% (1995)