78% (2003)

72% (2011)

67% (2009)

76% (2002)

67% (2006)

70% (2000)

71% (1998)

62% (2009)

70% (2013)

58% (1992)

58% (2005)

69% (2005)

64% (2003)

54% (2007)

70% (2000)

43% (2005)

57% (2005)

58% (2012)

67% (2016)

70% (1998)