10% (1987)

59% (1987)

32% (1991)

50% (1989)

58% (1988)

20% (1994)

0% (1990)

10% (1985)

52% (1988)

57% (1989)

60% (1986)

0% (1987)

43% (1985)

10% (1986)

55% (1986)

0% (1981)

50% (1985)

50% (1986)

43% (1983)

43% (1987)