71% (1988)

74% (2010)

63% (1998)

74% (1997)

78% (1975)

55% (1987)

72% (1998)

61% (1989)

73% (1989)

69% (2003)

75% (2008)

70% (2004)

76% (2009)

63% (2010)

82% (1957)

58% (2014)

80% (2017)

74% (2018)

62% (1999)

56% (2011)