56% (1975)

68% (1981)

76% (1972)

47% (1978)

64% (1989)

67% (1977)

76% (1975)

68% (1984)

61% (1980)

0% (1973)

39% (1984)

59% (1989)

58% (1981)

43% (1984)

48% (1979)

53% (1978)

69% (1984)

20% (1985)

55% (1987)

50% (1986)