10% (1991)

77% (1988)

69% (1993)

63% (1994)

70% (1995)

56% (1993)

73% (1983)

65% (1983)

68% (1989)

76% (1995)

70% (1988)

77% (1988)

65% (1991)

63% (1985)

40% (1994)

57% (1989)

67% (1992)

60% (1985)

56% (1986)

53% (1989)