70% (2010)

72% (2013)

69% (2017)

72% (2003)

71% (1996)

71% (2000)

77% (1997)

75% (1999)

76% (2002)

57% (1995)

70% (2015)

61% (2005)

61% (2004)

75% (1991)

63% (2007)

70% (2008)

69% (2004)

71% (2008)

65% (2017)

69% (2001)