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Concentration(ppb) <br /> 10/1187 <br /> 212/88 <br /> 6/24/88 -- <br /> 1/18/89 -- <br /> 10112189 -- <br /> 3/13/91 <br /> 124/881118/8910/12/893/13/91 <br /> -- <br /> 3/16/92 -- <br /> 6r2192 <br /> 12115192 -- <br /> 3/12193 -- <br /> 6/30193-- <br /> 8/31/93 - <br /> 12/16/93 - <br /> 2/15/9231121936/30193813119312/16/93 0 <br /> 4/29/94 n <br /> O eb <br /> 9/27/94 = <br /> m 7/27195 N <br /> = O <br /> mm . <br /> 11/16M t <br /> m <br /> Z N <br /> m f° 217/96 eD <br /> 5/21/96 -- <br /> i <br /> /21/96 <br /> O <br /> z 8/28/96 cd <br /> D <br /> 12130/96-- <br /> 2121/97 -- <br /> 519/97 - <br /> &14W <br /> 2/30/9621211975191978114197 <br /> 11/6197 <br /> 2/13198 <br /> 5/19198 <br /> 816198 <br /> 11/5198 <br /> 2124/99 <br /> 5111199 <br /> 8110/99 <br /> 11/8/99 <br /> 2/8/00 , <br />