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Concentration(ppb) <br /> 1011187 <br /> 212188 <br /> 6/24/88 -- <br /> 1118/89 -- <br /> 10112189 -- <br /> 3113/91 <br /> /24/881118/8910/12/893113/91 <br /> -- <br /> 3116/92 -- <br /> 6/2192 -- <br /> 12115/92 -- <br /> 3112t93 <br /> 116/92612/9212/15/923112/93 <br /> 6130/93 -- <br /> 8131/93 -- <br /> 12/16/93 -- <br /> 4129/94-- <br /> 9127/94-- <br /> 0 <br /> 130/938131/9312/16/934129/949127/94 <br /> 7127/95 n <br /> O N <br /> 11/16/95 - <br /> 2f7/96 <br /> 1/16/95217/96 <br /> O <br /> m 5/21196 m <br /> C <br /> z 8/28196 <br /> m 12/30/96 <br /> 2121/97 ep <br /> z 5/9197 -+ <br /> 8/14/97 <br /> 11/6197 <br /> 2/13198 <br /> 5/19198 <br /> 8/6198 <br /> 1115198 <br /> 2124199 <br /> 5/11199 <br /> 8/10199 <br /> 11/8199 <br /> 218100 <br /> 5/2/00 <br /> 8110/00 <br /> 11/14/00 <br /> 2!9101 . <br /> 5122/01 <br />