82% (1994)

80% (1994)

69% (2008)

64% (1985)

75% (1996)

77% (1986)

73% (1999)

65% (1997)

76% (2001)

63% (2000)

62% (1986)

67% (2004)

68% (1993)

48% (2009)

51% (1972)

62% (1990)

55% (2009)

70% (1992)

64% (2001)

56% (2011)