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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

1990  -99.99  -99.99  -99.99  -99.99  -99.99  -99.99  -99.99  -99.99  -99.99  -99.99  360.99  361.23  -99.99
1991  362.61  364.41  364.61  364.04  362.59  358.17  354.94  353.76  354.58  357.18  359.62  362.42  359.91
1992  364.11  365.26  367.56  368.78  366.17  357.92  351.15  347.45  351.91  359.34  362.95  364.90  360.63
1993  364.50  364.61  365.25  364.25  367.18  364.21  351.95  349.06  352.89  357.63  363.02  363.43  360.67
1994  364.29  364.67  365.70  366.50  363.88  361.07  355.16  347.59  350.94  361.81  366.71  366.47  361.23
1995  366.43  367.32  367.54  368.38  367.25  362.99  359.02  355.65  357.04  362.75  365.19  368.00  363.96
1996  369.23  368.11  368.44  370.28  369.73  364.76  361.51  361.97  362.54  364.59  367.39  368.03  366.38
1997  368.18  369.38  371.69  371.53  369.29  367.27  363.25  358.56  360.25  365.64  367.91  370.51  366.96
1998  372.17  372.86  374.69  377.54  373.92  368.69  367.64  361.20  361.91  369.33  373.36  374.41  370.64
1999  374.28  375.08  376.79  376.98  375.11  370.03  367.24  365.70  365.40  368.98  371.96  372.97  371.71
2000  374.66  377.41  377.68  375.90  373.45  370.78  368.61  367.84  369.58  372.95  374.97  376.23  373.34
2001  376.68  377.86  380.55  381.26  377.32  373.88  374.08  370.21  369.03  374.01  375.57  376.56  375.58
2002  379.32  380.01  381.98  386.16  383.21  374.28  370.21  373.31  374.99  375.13  377.03  378.15  377.82

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.