74% (1997)

82% (2016)

74% (2011)

80% (1972)

73% (2011)

75% (1981)

80% (1999)

80% (2003)

71% (2015)

77% (2017)

77% (1997)

79% (2009)

72% (2015)

79% (2004)

77% (2005)

79% (2015)

72% (1987)

71% (1993)

60% (1991)

71% (1965)