70% (1993)

77% (1988)

70% (1995)

56% (1993)

64% (1983)

72% (1983)

75% (1995)

63% (1994)

63% (1985)

65% (1985)

65% (1991)

68% (1992)

68% (1989)

56% (1989)

42% (1994)

64% (1995)

77% (1988)

81% (1991)

72% (1986)

50% (1987)