50% (1988)

65% (1980)

46% (1985)

38% (1983)

60% (1988)

0% (1975)

45% (1984)

58% (1987)

0% (1980)

63% (1976)

64% (1986)

53% (1987)

47% (1978)

70% (1986)

62% (1987)

56% (1973)

30% (1978)

62% (1989)

64% (1987)

62% (1982)