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Concentration(ppb) <br /> N N W W <br /> q O O O O O O O <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 /> Nov-99 <br /> Jan-00 <br /> Mar-00 3 <br /> m <br /> May-00 y <br /> Jul-00 0 <br /> Sep-00 <br /> e <br /> Nov-00 m <br /> Jan-01 <br /> _+ <br /> Mar-01 � 3 <br /> May-01 m p <br /> a � <br /> Jul-01 e w <br /> Sep-01 ------ N <br /> Nov-01 <br /> I � <br /> Jan-02 3 <br /> Mar-02 C <br /> May-02 <br /> Jul-02 m <br /> Sep-02 <br /> Nov-02 <br /> Jan-03 <br /> Mar-03 <br /> May-03 <br /> Jul-03 <br /> Sep-03 z <br /> cn o <br /> Nov-03 <br /> c <br /> Jan-04 0 C <br /> CD <br /> Mar-04 o <br /> CO 0 <br /> May-04 <br /> Jul-04 <br /> Sep-04 <br /> i <br /> Nov-04 <br /> Jan-05 <br /> Mar-05 <br />