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Concentration(ppb) <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 /> n <br /> May-93 7 <br /> v n <br /> Sep-93 <br />� Jan-94 H <br /> m May-94 rr. = O <br /> mSep-94 H <br /> v <br /> m Jan-95 <br /> May-95 <br /> Sep-95 <br /> Jan-96 <br /> i <br /> 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 />