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*** American Samoa, Cape Matatula isotopic ratio of             ***
*** atmospheric 13C/12C (permil) averages of data               ***
*** adjusted to the 15th of each month                          ***
*** Source: C.D. Keeling, A.F. Bollenbacher, and T.P. Whorf     ***
***         Carbon Dioxide Research Group                       ***
***         Scripps Institution of Oceanography (SIO)           ***
***         University of California                            ***
***         La Jolla, California USA 92093-0444                 ***
***                                                             ***
*** March 2005                                                  ***
***                                                             ***
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Year   Jan     Feb     Mar     Apr     May     Jun     Jul     Aug     Sep     Oct     Nov     Dec     Ave     FitAve

1984  99.999  -7.727  -7.657  -7.500  -7.631  -7.568  -7.618  -7.621  -7.552  -7.668  -7.624  -7.623  99.999  99.999  
1985  -7.543  -7.562  -7.595  -7.655  -7.645  -7.581  -7.593  -7.671  99.999  -7.603  -7.571  -7.570 (-7.600) -7.608
1986  -7.617  99.999  -7.636  -7.700  -7.587  -7.608  -7.631  -7.650  -7.661  -7.683  -7.741  -7.686 (-7.652) -7.639
1987  -7.629  -7.619  -7.684  -7.652  -7.668  -7.681  -7.674  -7.678  -7.668  -7.670  -7.735  -7.717  -7.673  -7.679
1988  -7.721  -7.731  -7.768  -7.745  -7.687  -7.695  -7.762  -7.770  -7.756  -7.765  99.999  99.999 (-7.743) -7.741
1989  99.999  -7.767  -7.748  -7.769  -7.779  -7.786  -7.718  -7.740  -7.723  -7.777  -7.746  -7.746 (-7.755) -7.759
1990  -7.751  -7.760  -7.769  -7.766  -7.790  -7.788  -7.785  -7.782  -7.808  -7.760  -7.780  -7.742  -7.773  -7.770
1991  -7.736  -7.752  -7.766  -7.749  -7.758  -7.780  -7.773  -7.722  -7.759  -7.754  -7.719  -7.759  -7.752  -7.755
1992  -7.734  -7.753  -7.746  -7.755  -7.771  -7.789  -7.801  -7.815  -7.798  -7.812  -7.798  -7.759  -7.778  -7.773
1993  -7.742  -7.752  -7.769  -7.780  -7.769  -7.798  -7.842  -7.776  -7.765  -7.779  -7.794  -7.740  -7.776  -7.781
1994  -7.779  -7.810  -7.807  -7.793  -7.782  -7.806  -7.779  -7.811  -7.800  -7.809  -7.815  -7.836  -7.802  -7.800
1995  -7.844  -7.854  -7.836  -7.811  -7.818  -7.839  -7.877  -7.839  -7.826  -7.851  -7.852  -7.873  -7.843  -7.840
1996  -7.854  -7.870  -7.873  -7.859 - 7.875  -7.863  -7.866  -7.886  -7.878  -7.895  -7.874  -7.876  -7.872  -7.869
1997  -7.907  -7.880  -7.880  -7.882  -7.866  -7.838  -7.878  -7.900  -7.886  -7.888  -7.900  -7.917  -7.885  -7.885
1998  -7.942  -7.935  -7.912  -7.909  -7.925  -7.947  -7.972  -7.950  -7.961  -7.960  -7.975  -7.977  -7.947  -7.946
1999  -7.990  -7.990  -7.993  -7.986  -7.994  -7.998  -8.018  -7.984  -7.976  -7.974  -7.975  -7.991  -7.989  -7.989
2000  -8.006  -8.005  -7.974  -7.973  -7.961  -7.970  -7.995  -7.978  -7.944  -7.956  -7.969  -7.999  -7.977  -7.976
2001  -7.966  -7.996  -7.995  -7.987  -7.978  -7.967  -7.996  -7.978  -7.986  -7.981  -8.010  -7.987  -7.986  -7.982
2002  -7.982  -8.017  -7.997  -7.990  -8.009  -8.015  -8.023  -8.023  -8.012  -8.037  -8.040  -8.079  -8.019  -8.019


Monthly averages have been adjusted to the 15th of each month. Missing values are
denoted by 99.999. Annual average data have been augmented (data in parentheses) when 
only 1 or 2 months are missing for that year, by substituting the monthly fit value(s) 
for missing (99.999) data and then averaging the 12 values. The month without data is still 
shown as 99.999 while this recomputed annual average is shown in parentheses. These monthly 
data have been adjusted from January 1992 to the present by adding -0.112 per mil.