*********************************************************************
***  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

1982  -99.99  -99.99  344.79  345.07  344.85  342.09  337.71  334.78  335.82  338.76  340.60  342.12  -99.99
1983  343.31  343.95  345.55  347.09  345.22  342.61  340.23  335.95  337.11  341.80  345.16  347.83  342.98
1984  347.51  346.98  348.05  348.69  347.74  343.31  339.82  339.87  340.98  341.89  344.78  349.44  344.92
1985  351.21  349.51  349.08  349.91  349.96  347.80  343.77  340.79  343.02  345.72  347.52  350.27  347.38
1986  351.79  351.42  350.87  350.90  350.98  349.49  342.71  340.46  345.07  346.49  347.89  350.32  348.20
1987  351.84  352.10  352.39  354.40  354.13  351.04  346.31  344.13  348.50  353.27  352.61  352.69  351.12
1988  354.59  355.57  355.76  356.32  355.74  353.29  349.50  346.84  348.14  349.84  351.56  354.85  352.67
1989  357.38  357.88  356.87  356.50  357.01  354.80  349.14  347.49  351.56  354.36  354.60  355.92  354.46
1990  357.05  357.25  358.42  358.84  357.79  355.16  351.59  349.78  351.29  353.87  356.47  358.40  355.49
1991  358.79  359.56  360.09  359.65  359.11  357.09  352.07  349.23  353.76  357.52  357.52  357.42  356.82
1992  359.72  361.33  360.55  359.68  359.93  357.67  352.27  347.62  349.08  353.90  357.01  360.13  356.57
1993  362.88  361.42  360.52  361.79  360.74  356.65  352.60  351.19  353.79  358.79  361.55  360.69  358.55
1994  362.30  363.74  362.58  362.29  360.57  358.33  355.85  356.66  361.51  363.25  362.64  364.04  361.15
1995  364.25  362.12  362.29  364.41  364.22  362.09  -99.99  -99.99  -99.99  360.25  -99.99  -99.99  -99.99
1996  367.40  367.57  366.80  367.45  367.28  365.27  360.60  357.05  357.95  -99.99  -99.99  365.92  -99.99
1997  366.20  365.36  366.54  367.53  367.90  365.57  359.56  356.97  361.81  365.61  365.27  365.31  364.47

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.