horizontal bands of black smoke

2.9715% 1984 0.555238 1.801028 3.6576% 1983 7.316862 0.136671 3.8998% 1982 12.346219 0.080996 6.3831% 1981 7.230814 0.138297 9.6843% 1980 0.322834 3.097565 9.0330% 1979 9.357584 0.106865 8.8650% 1978 4.718939 0.211912 7.2813% 1977 9.219384 0.108467 6.6558% 1976 7.987384 0.125197 6.4073% 1975 8.352050 0.119731 9.8159% 1974 7.605501 0.131484 9.0909% 1973 0.235939 4.238383 6.4509% 1972 3.185026 0.313969 4.7304% 1971 3.415395

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