60% (1987)

20% (1994)

58% (1988)

54% (1988)

50% (1989)

50% (1987)

57% (1989)

10% (1985)

0% (1990)

50% (1986)

10% (1986)

20% (1985)

0% (1987)

45% (1993)

35% (1986)

43% (1983)

55% (1986)

10% (1985)

20% (1985)

0% (1990)