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Concentration(ppb) • <br /> p O <br /> d Q O <br /> o d o 0 <br /> 0 0 a a o �o <br /> Jan-89 <br /> May-89 <br /> Sep-89 <br /> Jan-90 <br /> May-90 <br /> Sep-9D <br /> Jan-91 <br /> May-91 <br /> Sep-91 <br /> Jan-92 <br /> May-92 <br /> Sep-92 <br /> Jan-93 <br /> May-93 <br /> Sep-93 C <br /> Jan-94 n <br /> May-94 <br /> Sep-94 H <br /> m Jan-95 = O <br /> mMay-95 c <br /> z <br /> m � Sep-95 � <br /> Jan-96 r <br /> May-96 <br /> -a <br /> = Sep-96 <br /> Cn <br /> Jan-97 <br /> May-97 <br /> Sep-97 <br /> Jan-98 <br /> May-98 <br /> Sep-98 <br /> Jan-99 <br /> May-99 <br /> Sep-99 <br /> Jan-00 <br /> May-00 <br /> Sep-00 <br /> Jan-01 <br /> May-01 <br /> Sep-01 <br /> Jan-02 <br /> May-02 <br />