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Micrograms per Liter <br /> O N <br /> O N ul W <br /> Jan-04 <br /> Apr-04 <br /> Jul-04 <br /> Oct-04 <br /> Jan-05 n <br /> Apr-05 0 <br /> C7 <br /> Jul-05 (� <br /> Oct-05 <br /> n <br /> Jan-06 cD <br /> Apr-06 <br /> Jul-O6 <br /> Oct-06 <br /> tN <br /> Jan-07 _ <br /> Apr-07 <br /> E3o v Jul-07 O <br /> CD <br /> M Oct-07 O <br /> } Jan-08 <br /> 7 <br /> n <br /> Apr-08 (G <br /> M Jul-08 <br /> Oct-08 <br /> Jan-09 <br /> Apr-09 00 <br /> Jul-09 <br /> Oct-09 <br /> Jan-1 0 <br /> Apr-10 <br /> Jul-10 <br /> Oct-10 <br /> Jan-11 <br /> Apr-11 1 -- ---- - —1- -- --- <br />