61% (2009)

69% (2006)

63% (2004)

67% (2005)

67% (2008)

67% (1999)

60% (2007)

67% (2002)

71% (2015)

59% (2011)

68% (1992)

63% (2000)

65% (2009)

71% (2004)

63% (1984)

64% (1993)

62% (2002)

65% (1996)

75% (1999)

72% (2000)