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Concentration(ppb) <br /> N W A [71 C V <br /> 0 0 o n o 0 0 0 <br /> Sep-97 <br /> Nov-97 <br /> Jan-98 <br /> Mar-98 <br /> May-98 <br /> Jul-98 <br /> Sep-98 <br /> Nov-98 <br /> Jan-99 <br /> Mar-99 <br /> May-99 <br /> Jul-99 <br /> Sep-99 <br /> N ov-99 <br /> Jan-00 <br /> Mar-00 <br /> May-00 <br /> Jul-00 <br /> Sep-00 <br /> Nov-00 3 <br /> C <br /> Jan-01 <br /> Mar-01 0 <br /> O <br /> May-01 <br /> Jul-01 rt <br /> Sep-01 a <br /> Nov-01 O <br /> Jan-02 <br /> Mar-02 <br /> I T <br /> May-02 = <br /> G1 <br /> Jul-02 <br /> Sep-02 <br /> Nov-02 <br /> Jan-03 <br /> Mar-03 <br /> May-03 <br /> Jul-03 <br /> Sep-03 <br /> Nov-03 <br /> Jan-04 <br /> Mar-04 <br /> May-04 <br /> Jul-04 <br /> Sep-04 <br /> Nov-04 <br /> Jan-05 <br /> Mar-05 <br /> May-05 <br /> Jul-05 <br /> Sep-05 <br />