69% (1993)

76% (1988)

70% (1995)

77% (1988)

65% (1983)

73% (1983)

67% (1992)

76% (1995)

63% (1994)

65% (1991)

68% (1989)

63% (1985)

80% (1991)

50% (1985)

57% (1989)

56% (1986)

56% (1993)

68% (1983)

55% (1984)

69% (1992)