48% (1987)

67% (1990)

33% (1988)

54% (1988)

61% (1989)

52% (1986)

58% (1990)

59% (1988)

58% (1989)

55% (1987)

61% (1988)

64% (1991)

63% (1986)

52% (1987)

64% (1993)

53% (1987)

55% (1993)

71% (1986)

69% (1994)

76% (1984)