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Concentration(ppb) • <br /> C) o <br /> 0 0 <br /> 0 0 0 <br /> o a a v <br /> C> a o 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 n <br /> X <br /> Jul-95 0 7 <br /> m Jan-96 .'�•. <br /> m . <br /> m Jul-96 <br /> fu <br /> m Jan -97 N <br /> Jul-97 <br /> M <br /> Jan-98 <br /> G) Jul-98 <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 /> • <br /> 4 fn <br />