75% (2004)

74% (2008)

76% (2006)

79% (1993)

66% (1992)

72% (2008)

74% (2009)

71% (1994)

61% (2004)

72% (1994)

76% (2009)

70% (1997)

63% (2008)

76% (1999)

60% (2000)

60% (2010)

56% (2001)

65% (2008)

69% (1991)

0% (1989)