71% (1997)

68% (1997)

67% (2002)

67% (2005)

72% (2006)

67% (1999)

59% (2011)

74% (2002)

74% (2011)

74% (2002)

71% (1998)

65% (2004)

69% (1993)

62% (2011)

60% (2007)

71% (2015)

69% (1987)

63% (2000)

62% (1999)

69% (2010)