73% (1990)

68% (1985)

64% (1986)

67% (1981)

68% (1980)

79% (1981)

56% (1989)

51% (1984)

48% (1988)

64% (1982)

61% (1989)

69% (1982)

43% (1986)

0% (1985)

50% (1984)

55% (1986)

35% (1984)

58% (1986)

0% (1986)

61% (1984)