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Concentration(ppb) <br /> o <br /> C C <br /> 0 0 0 <br /> C o 0 0 <br /> C) p o O 0 <br /> Jan-89 <br /> Jul-89 <br /> Jan-90 <br /> Jul-90 <br /> Jan-91 <br /> Jul-911 <br /> Jan-92 <br /> Jul-92 <br /> Jan-93 <br /> Jul-93 <br /> Jan-94 <br /> Jul-94 0 <br /> Jan-95 <br /> O <br /> 7 <br /> Jul-95 �p <br /> w su <br /> Jan-96 y 0 . <br />� W <br /> Jul-96 N <br /> v � � <br /> CD Jan-97 m : <br /> r (C <br /> Jul-97 IN <br /> 0 <br /> Jan-98 <br /> CPR <br /> Jul-98 <br /> Jan-99 <br /> Jul-99 <br /> 00 <br /> z Jan-00 <br /> N <br /> z Jul-00 <br /> m <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 /> • <br /> vt � <br />