76% (1989)

69% (2007)

64% (2008)

69% (1989)

80% (2005)

68% (1993)

72% (1988)

71% (1990)

60% (2007)

73% (2002)

74% (1987)

83% (2004)

66% (2006)

47% (2007)

58% (1990)

71% (1992)

60% (2006)

63% (1996)

62% (1998)

64% (1983)