79% (1988)

78% (2002)

63% (2010)

71% (1992)

69% (2007)

68% (2014)

68% (2004)

63% (2010)

69% (2007)

72% (2008)

72% (2004)

60% (2010)

53% (1999)

67% (2015)

70% (2007)