75% (2010)

75% (1996)

82% (1994)

76% (2001)

77% (1986)

63% (1985)

68% (1993)

64% (1999)

69% (2008)

63% (2000)

74% (1999)

61% (2008)

41% (1994)

71% (1992)

60% (1996)

65% (1997)

62% (1987)

56% (2004)

69% (2009)

55% (1982)