79% (1994)

76% (2001)

63% (2000)

64% (1985)

82% (1994)

77% (1986)

75% (1996)

62% (1990)

41% (1994)

69% (2008)

67% (2004)

73% (1999)

65% (1997)

70% (1992)

60% (2009)

71% (2000)

62% (1986)

68% (1993)

56% (2004)

51% (2007)