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Concentration(ppb) <br /> p_ p4 <br /> Jan-89 <br /> May-89 <br /> Sep-89 <br /> Jan-90 <br /> May-90 <br /> Sep-90 a <br /> Jan-91 <br /> May-91 <br /> a <br /> Sep-91 ` <br /> _ <br /> Jan-92 <br /> May-92 <br /> Sep-92 <br /> Jan-93 ; <br /> May-93 <br /> Sep-93 <br /> Jan-94 <br /> May-94 7 4 n <br /> Sep-94 i m <br /> Jan-95 a <br /> rn May-95 i N <br /> m Sep 95 } • <br /> m Jan-96 y <br /> a <br /> May-96 <br /> Sep-96 <br /> = Jan-97 # <br /> May-97 4�b <br /> Sep-97 <br /> Jan-98 <br /> i <br /> May-98 <br /> Sep-98 <br /> Jan-99 ' <br /> May-99 <br /> Sep-99 <br /> i <br /> Jan-00 <br /> May-00 <br /> r <br /> Sep-00 ; <br /> Jan-01 <br /> May-01 <br /> Sep-01 <br /> Jan-02 <br /> May-02 = <br /> Sep-02 <br /> Jan-03 <br /> May-03 <br /> 14 <br />