73% (1991)

72% (1993)

74% (1990)

65% (1995)

55% (1985)

47% (1986)

66% (1986)

68% (1983)

59% (1996)

72% (1987)

62% (1993)

72% (1989)

73% (1989)

59% (2002)

54% (1985)

59% (1993)

65% (1995)

45% (1999)

61% (2003)

69% (1991)