66% (1990)

62% (1981)

59% (1988)

47% (1984)

70% (1984)

64% (1984)

64% (1983)

64% (1982)

58% (1971)

69% (1989)

59% (1983)

62% (1990)

45% (1985)

76% (1980)

62% (1981)

68% (1985)

60% (1980)

56% (1979)

38% (1986)

51% (1987)