32% (1987)

67% (1990)

64% (1993)

52% (1988)

42% (1988)

61% (1989)

63% (1992)

33% (1986)

56% (1993)

41% (1994)

59% (1988)

44% (1990)

63% (1994)

30% (1988)

62% (1988)

63% (1986)

70% (1994)

58% (1990)

41% (1986)

69% (1990)