58% (1983)

23% (1987)

52% (1988)

42% (1984)

60% (1986)

10% (1986)

43% (1984)

54% (1988)

54% (1985)

57% (1989)

48% (1988)

45% (1985)

0% (1990)

50% (1989)

20% (1994)

32% (1991)

57% (1987)

10% (1985)

0% (1984)

20% (1987)