10% (1987)

54% (1988)

60% (1987)

20% (1994)

54% (1986)

52% (1988)

50% (1985)

43% (1987)

20% (1983)

57% (1989)

10% (1985)

50% (1989)

45% (1993)

32% (1991)

58% (1988)

50% (1986)

20% (1993)

35% (1994)

20% (1979)

10% (1985)