20% (1994)

60% (1987)

50% (1989)

54% (1988)

10% (1987)

50% (1985)

43% (1983)

50% (1986)

33% (1986)

52% (1988)

58% (1988)

20% (1979)

43% (1985)

57% (1992)

20% (1985)

10% (1985)

32% (1991)

45% (1993)

20% (1993)

0% (1990)