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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

1985  -99.99  -99.99  -99.99  -99.99  -99.99  350.06  343.69  337.77  338.97  342.74  345.56  348.82  -99.99
1986  351.19  352.00  352.55  352.93  353.15  351.23  345.53  340.22  339.76  344.24  347.85  349.56  348.35
1987  350.87  352.25  353.32  353.85  354.10  352.70  347.92  341.80  341.65  346.26  350.20  352.43  349.78
1988  354.25  355.49  356.44  357.26  357.26  355.15  349.89  344.61  345.37  350.20  353.96  355.80  352.97
1989  357.72  359.33  360.05  359.53  359.13  357.64  351.87  345.87  346.55  350.73  355.60  359.01  355.25
1990  359.54  359.78  360.55  360.74  360.36  357.27  350.94  346.32  346.73  351.32  355.85  358.22  355.64
1991  360.41  361.41  361.45  361.71  361.56  359.84  353.87  347.81  348.20  352.69  357.31  361.21  357.29
1992  362.67  362.73  363.22  362.93  362.84  361.41  354.03  347.04  347.60  352.13  356.36  359.85  357.73
1993  361.23  361.69  362.64  363.30  363.43  360.58  353.43  348.35  348.88  353.33  357.24  360.22  357.86
1994  362.59  364.09  364.74  364.53  364.17  362.15  356.15  350.29  350.67  355.27  360.19  362.97  359.82
1995  364.09  365.29  365.86  365.40  365.37  363.44  357.80  352.43  353.12  357.22  362.25  365.25  361.46
1996  365.96  366.60  367.10  367.47  368.29  367.16  362.33  355.75  354.53  359.11  363.45  365.88  363.64
1997  367.89  368.50  368.06  368.17  368.76  366.98  360.50  354.86  355.81  360.69  364.79  367.20  364.35
1998  369.21  370.26  370.26  370.46  371.23  369.55  363.31  358.21  359.32  364.14  368.68  371.47  367.18
1999  372.90  373.63  373.92  374.26  374.47  372.07  364.90  359.18  360.30  364.96  369.27  372.36  369.35
2000  373.50  374.31  374.99  375.39  375.80  373.06  366.37  361.43  361.95  366.71  370.45  373.22  370.60
2001  375.27  376.05  376.26  377.05  377.54  374.21  366.91  361.96  363.46  368.40  372.97  375.26  372.11
2002  376.80  377.86  378.39  378.63  378.34  375.63  370.05  364.58  365.35  370.14  374.31  376.47  373.88

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.