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Concentration(ppb) • <br /> 0 <br /> 0 0 <br /> 0 0 0 <br /> 0 0 0 0 <br /> 0 0 0 0 0 <br /> Jan-89 <br /> Jul-89 <br /> Jan-90 <br /> Jul-90 <br /> Jan-91 <br /> Jul-91 <br /> Jan-92 <br /> Jul-92 <br /> Jan-93 <br /> Jul-93 <br /> Jan-94 <br /> Jul-94 <br /> Jan-95 0 <br /> Ju!-95 p <br /> O <br /> Jan-96 <br /> y N• <br /> m Jul-96 lu O <br /> z lu v <br /> Jan-97 - N <br /> v <br /> m Jul-97 M 3 <br /> Jan-98 CD <br /> Jul-9$ � <br /> Jan-99 <br /> Jul-99 <br /> Jan-00 <br /> Jul-00 <br /> Jan-01 <br /> Jul-01 <br /> Jan-02 <br /> Jul-02 <br /> Jan-03 <br /> Jul-03 <br /> Jan-04 <br /> Jul-04 <br /> Jan-05 <br /> Jul-05 <br />