60% (1987)

35% (1986)

33% (1986)

50% (1987)

57% (1989)

32% (1991)

10% (1987)

20% (1994)

45% (1993)

50% (1986)

50% (1989)

43% (1985)

20% (1979)

43% (1987)

58% (1988)

52% (1988)

0% (1990)

54% (1988)

55% (1986)

10% (1985)