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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

1987  -99.99  -99.99  -99.99  -99.99  -99.99  -99.99  -99.99  -99.99  -99.99  -99.99  348.35  349.67  -99.99
1988  351.35  352.12  352.69  353.70  354.38  353.44  351.47  349.85  348.89  348.46  350.12  352.38  351.57
1989  353.60  353.86  354.45  355.15  355.75  354.74  351.81  350.11  349.60  349.61  351.27  352.96  352.74
1990  354.71  355.95  356.07  357.08  357.78  356.71  354.69  352.12  351.40  352.46  353.56  355.19  354.81
1991  356.12  356.61  357.80  358.96  358.85  358.19  356.13  353.23  352.40  352.99  354.16  355.93  355.95
1992  357.27  358.26  358.48  358.72  359.30  358.32  355.48  352.88  351.91  352.56  354.05  355.93  356.10
1993  357.10  357.84  358.88  359.93  360.17  358.91  356.37  353.85  352.71  353.42  355.53  357.35  356.84
1994  358.38  359.08  359.70  361.01  361.48  359.95  357.55  354.96  353.98  354.70  356.57  358.45  357.98
1995  359.97  361.42  362.16  362.50  362.95  362.26  360.11  357.45  356.45  358.05  360.01  360.96  360.36
1996  362.31  363.48  363.88  364.94  365.60  364.51  361.80  359.22  358.06  358.91  361.05  362.15  362.16
1997  363.44  364.67  365.25  366.15  366.25  365.12  362.55  359.73  358.69  360.36  362.66  364.05  363.24
1998  365.55  366.70  367.44  368.38  369.11  368.35  365.98  364.50  363.81  363.57  365.05  367.29  366.31
1999  368.87  369.59  370.05  370.63  370.95  369.72  366.40  364.02  363.56  364.28  365.94  367.98  367.67
2000  369.32  370.01  370.70  371.78  371.94  370.23  367.89  366.01  365.59  366.40  368.31  370.16  369.03
2001  371.36  372.51  373.29  373.51  373.81  372.79  370.36  368.31  367.52  367.93  370.16  372.28  371.15
2002  372.99  373.94  375.06  375.78  376.12  375.00  372.71  370.18  368.85  369.98  372.23  373.95  373.07

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.