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***  Atmospheric Carbon Dioxide Mixing Ratios from the            ***
***  NOAA CMDL Carbon Cycle Cooperative Global Air Sampling       ***
***  Network,  1968-2002                                          ***
***                                                               ***
***  March 2005                                                   ***
***                                                               ***
***  Source: Thomas J. Conway                                     ***
***          Pieter P. Tans                                       ***
***          NOAA Climate Monitoring and Diagnostics Laboratory   ***
***          325 Broadway                                         ***
***          Boulder, Colorado, U.S.A.                            ***
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Year   Jan     Feb     Mar     Apr     May     Jun     Jul     Aug     Sep     Oct     Nov     Dec     Ann

1993  -99.99  -99.99  -99.99  -99.99  358.52  355.68  352.92  352.25  354.82  357.26  359.16  360.73  -99.99
1994  360.96  362.37  363.52  362.63  362.41  363.93  362.49  357.32  356.84  359.83  360.91  363.95  361.43
1995  365.00  363.27  363.28  362.76  360.72  360.67  359.97  356.11  354.31  357.85  362.24  364.31  360.87
1996  366.00  367.50  366.36  364.88  364.93  363.66  360.86  358.17  356.25  358.47  363.29  365.35  362.98
1997  366.60  367.06  367.38  367.14  364.36  362.14  362.53  361.87  360.57  363.14  365.82  366.88  364.62
1998  367.91  369.06  369.66  368.62  366.16  365.44  364.50  362.41  363.32  366.14  368.61  370.63  366.87
1999  371.95  372.14  372.34  371.62  370.15  368.81  368.52  366.28  362.15  364.82  369.91  371.36  369.17
2000  372.50  373.95  373.84  372.65  371.76  371.13  370.57  367.53  365.07  368.22  372.88  375.39  371.29
2001  375.89  375.49  374.87  374.77  373.60  369.53  367.91  368.53  367.63  368.28  371.87  376.26  372.05
2002  377.34  377.60  377.23  375.88  374.06  372.59  373.20  371.02  370.69  374.07  376.28  377.42  374.78

Monthly measurements are reported in parts per million (ppm) and are directly traceable to 
the WMO CO2 mole fraction scale. Annual values are the arithmetic means of the 12 monthly values.