71% (2008)

75% (2011)

58% (1988)

79% (1998)

80% (2010)

76% (2013)

60% (1990)

71% (1993)

65% (2000)

40% (2000)

73% (1998)

0% (1994)

74% (2004)

86% (2005)

73% (2011)

77% (2008)

77% (2009)

60% (1991)

73% (2013)

50% (2001)