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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

1991  -99.99  -99.99  354.06  353.81  353.43  353.78  354.23  354.81  355.24  355.03  355.08  354.71  -99.99
1992  353.19  352.56  353.04  353.74  354.46  354.84  355.23  355.56  355.64  355.77  355.84  355.37  354.60
1993  354.69  354.47  354.74  355.29  355.28  355.00  355.42  356.03  356.48  356.87  356.63  355.99  355.57
1994  355.94  355.93  355.88  356.30  356.62  356.53  356.75  357.52  357.97  357.86  357.92  357.46  356.89
1995  356.44  356.36  357.03  357.22  356.89  357.25  357.70  358.37  359.28  359.35  359.55  359.89  357.94
1996  359.16  358.27  358.37  358.89  359.21  359.49  360.17  360.77  360.70  360.42  360.22  359.98  359.64
1997  359.50  359.24  359.53  359.98  360.45  360.98  361.29  361.39  361.40  361.36  361.64  361.71  360.71
1998  361.45  361.60  362.15  362.65  362.93  363.35  364.11  364.75  365.04  365.03  364.91  364.83  363.57
1999  364.54  364.34  364.72  365.11  365.07  365.35  -99.99  -99.99  -99.99  -99.99  -99.99  366.34  -99.99
2000  365.70  365.47  365.93  366.16  366.28  366.71  367.03  367.46  367.89  367.98  367.84  367.58  366.84
2001  367.23  367.03  367.19  367.23  367.62  368.51  368.87  369.10  369.49  369.90  -99.99  -99.99  -99.99
2002  -99.99  -99.99  -99.99  -99.99  -99.99  370.53  370.77  371.45  371.73  371.69  -99.99  -99.99  -99.99

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.