10% (1987)

43% (1983)

32% (1991)

43% (1984)

20% (1994)

10% (1985)

57% (1989)

60% (1986)

59% (1987)

43% (1985)

0% (1990)

45% (1993)

50% (1989)

53% (1986)

50% (1985)

52% (1988)

54% (1988)

58% (1988)

50% (1986)

55% (1986)