76% (1999)

77% (1997)

72% (2000)

69% (1996)

72% (2013)

73% (2003)

70% (2010)

75% (1991)

70% (2012)

71% (2008)

70% (2015)

69% (2017)

57% (1995)

76% (2002)

61% (2004)

70% (2008)

61% (2005)

64% (2007)

64% (2002)

64% (2015)