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Concentration(ppb) <br /> 10/1187 - <br /> 2M88 <br /> 6/24/88 -- <br /> 8/89 <br /> 10112189 -- <br /> 3113/91 <br /> 3/16192 <br /> 6/2/92 <br /> 12/15/92 <br /> 3112193 <br /> 6130193 <br /> 8131193 <br /> 12/16/93 <br /> 4/29/94 <br /> n <br /> 9127194 0 to7 <br /> 7127195 <br /> 11/16/95 H <br /> m 217196 m <br /> z 5121196 3 <br /> m eD <br /> 8128196 � <br /> 12/30/96 <br /> 2121/97 <br /> G7 <br /> 519197 <br /> 8114197 <br /> 1116197 <br /> 2113/98 <br /> 5119/98 <br /> 816/98 <br /> 1115/98 <br /> 2124199 <br /> 5111/99 <br /> 8110199 <br /> 1118199 <br /> 218/00 <br /> 512!00 <br /> 8/10/00-- <br /> 11/14100 <br />