68% (1990)

61% (1989)

53% (1990)

53% (1988)

30% (1988)

56% (1987)

55% (1987)

52% (1987)

59% (1988)

57% (1989)

52% (1987)

61% (1988)

76% (1984)

48% (1987)

58% (1990)

44% (1990)

32% (1987)

63% (1994)

44% (1986)

63% (1986)