75% (2004)

74% (2008)

76% (2006)

79% (1993)

71% (2008)

73% (2009)

60% (2010)

71% (1994)

72% (1994)

56% (2001)

75% (1999)

48% (2009)

76% (2009)

63% (2008)

70% (1997)

0% (1989)

66% (1996)

69% (1991)

61% (2004)

88% (1982)