77% (1984)

68% (1988)

62% (1987)

72% (1991)

64% (1987)

74% (2003)

62% (1987)

62% (1987)

66% (2003)

69% (1989)

69% (1995)

61% (1999)

67% (1994)

68% (1991)

75% (1994)

60% (1985)

78% (1999)

72% (1994)

71% (1989)

70% (1988)