73% (1991)

72% (1993)

74% (1990)

65% (1995)

68% (1991)

59% (1996)

73% (1989)

54% (1985)

68% (1983)

54% (1985)

58% (2002)

73% (1989)

67% (1986)

59% (1993)

72% (1987)

62% (1993)

46% (1999)

61% (2003)

46% (1986)

65% (1995)