62% (2011)

65% (2014)

69% (1993)

69% (2012)

64% (2002)

68% (2002)

71% (1997)

64% (2000)

67% (2008)

69% (2004)

69% (2006)

61% (2009)

72% (2003)

67% (1989)

59% (2011)

61% (1998)

61% (1998)

70% (1987)

73% (1999)

71% (2015)