73% (1990)

64% (1986)

68% (1985)

67% (1981)

64% (1982)

51% (1984)

56% (1989)

0% (1985)

79% (1981)

69% (1982)

43% (1986)

68% (1980)

61% (1989)

55% (1986)

48% (1988)

58% (1986)

43% (1987)

72% (1979)

0% (1983)

20% (1985)