68% (1993)

76% (2001)

82% (2011)

79% (2002)

77% (1987)

67% (1968)

79% (2006)

75% (1999)

80% (1986)

67% (1992)

74% (1997)

72% (2002)

69% (2009)

82% (2009)

76% (1984)

51% (1998)

78% (2021)

69% (1985)

61% (1991)

82% (2015)