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X106 <br />3.0 AN AL V <br />OLUME <br />....... is EAR RUNNING AVE. <br />2.5 <br />U <br />0 <br />L <br />U <br />M 2.0 <br />E <br />I <br />N <br />A <br />C <br />R 1.5 <br />E <br />F <br />E <br />E <br />T <br />1.0 <br />0.5 <br />8.0. <br />1920 1930 1940 1950 i960 1970 1980 1990 <br />YEAR <br />ANNUAL VOLUME AND TEN YEAR RUNNING AVERAGE <br />Figure 10 <br />N <br />N