50% (1989)

0% (1991)

50% (1978)

65% (1994)

80% (1996)

0% (1986)

61% (1988)

60% (1975)

0% (1990)

80% (1981)

0% (1979)

57% (1988)

35% (1986)

58% (1982)

52% (1982)

0% (1985)

40% (1984)

0% (1988)

38% (1980)

30% (1983)