75% (2010)

77% (1986)

82% (1994)

75% (1996)

74% (1999)

68% (1993)

69% (2008)

64% (1999)

76% (2001)

63% (2000)

63% (1985)

55% (1982)

71% (1992)

61% (2008)

42% (1995)

52% (2009)

56% (2004)

62% (1990)

62% (1987)

69% (2009)