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Concentration(ppb) i <br /> o <br /> Jan-89 <br /> May-89 <br /> Sep-89 <br /> Jan-90 <br /> May-90 <br /> Sep-90 <br /> Jan-91 <br /> May-91 <br /> Sep-91 <br /> Jan-92 <br /> May-92 <br /> Sep-92 <br /> Jan-93 <br /> May-93 p <br /> Sep-93 O <br /> O (D <br /> Jan-94 <br /> May-94 in a: <br /> O <br /> m Sep-94 21) <br /> IN 3 <br /> m <br /> m May-95 <br /> Sep-95 <br /> _0 Jan-96 O <br /> ch <br /> 0 May-96 <br /> Sep-96 <br /> Jan-97 <br /> May-97 <br /> Sep-97 <br /> Jan-98 <br /> May-98 <br /> Sep-98 <br /> Jan-99 <br /> May-99 <br /> Sep-99 <br /> Jan-00 <br /> May-00 <br /> Sep-00 <br /> Jan-01 <br /> May-01 <br /> i <br />