82% (1994)

77% (1986)

74% (2010)

76% (2001)

63% (1985)

75% (1996)

69% (2008)

54% (1982)

63% (2000)

62% (1990)

74% (1999)

64% (1999)

38% (2001)

62% (1987)

65% (1997)

68% (1993)

62% (1986)

46% (2010)

71% (1992)

55% (2007)