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Concentration(ppb) . <br /> Jan-89 <br /> May-89 <br /> Sep49 <br /> Jan-90 <br /> May-90 <br /> Sep% <br /> Jan-9t <br /> May-9t <br /> Sep-94 <br /> Jan-92 <br /> May-s2 <br /> Sep-92 <br /> Jan-93 �j <br /> May-93 <br /> Sep-93 <br /> Jan-94 N <br /> May-94 � 3 <br /> o Sep-94 <br /> Jan-95 <br /> May-95 i <br /> Sep-95 <br /> s� <br /> Jan-96 <br /> May-96 <br /> Sep-96 <br /> Jan-97 <br /> May-97 <br /> Sep-97 <br /> Jan-98 <br /> m <br /> z May-9B <br /> N <br /> z Sep-98 <br /> z <br /> m <br /> Jan-99 <br /> May-99 <br /> a Sep-99 <br /> z <br /> LOJ Jan-00 <br /> May-00 <br /> Sep-00 <br />