74% (1991)

72% (1993)

74% (1990)

65% (1995)

67% (1983)

73% (1989)

65% (1995)

66% (1986)

59% (1996)

46% (1999)

72% (1989)

57% (1984)

72% (1987)

69% (1991)

54% (1985)

59% (2002)

61% (2003)

62% (1993)

50% (1985)

58% (1993)