23% (1987)

52% (1988)

60% (1986)

54% (1985)

43% (1984)

58% (1983)

57% (1987)

50% (1989)

40% (1986)

45% (1985)

28% (1986)

20% (1994)

32% (1991)

0% (1990)

0% (1984)

10% (1985)

42% (1984)

57% (1989)

0% (1984)

20% (1985)