71% (1987)

83% (1985)

73% (1985)

67% (1997)

71% (1983)

66% (1987)

74% (1990)

64% (2004)

72% (1998)

63% (1999)

59% (1984)

73% (1983)

77% (1998)

67% (1994)

61% (2007)

69% (1990)

50% (1984)

68% (1989)

47% (1985)

60% (2002)