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*** Baring Head, New Zealand 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

1985  99.999  99.999  99.999  99.999  -7.628  99.999  -7.637  99.999  99.999  -7.670  99.999  -7.609  99.999  99.999
1986  -7.571  99.999  -7.582  99.999  -7.650  99.999  99.999  -7.631  -7.650  99.999  -7.568  99.999  99.999  -7.635
1987  99.999  -7.658  -7.701  99.999  -7.747  -7.655  -7.683  -7.628  -7.653  -7.682  -7.689  -7.681 (-7.674) -7.674
1988  -7.741  -7.681  -7.688  -7.713  -7.745  -7.720  -7.793  99.999  99.999  -7.665  -7.730  99.999  99.999  -7.717
1989  99.999  -7.743  -7.721  -7.745  -7.679  99.999  99.999  99.999  -7.783  99.999  -7.791  -7.745  99.999  -7.751
1990  -7.740  99.999  -7.795  -7.717  99.999  -7.788  99.999  -7.770  -7.830  -7.740  -7.825  99.999  99.999  -7.772
1991  -7.757  -7.733  -7.717  -7.738  -7.738  -7.779  -7.762  99.999  -7.745  -7.710  -7.689  99.999 (-7.741) -7.759
1992  -7.752  -7.731  99.999  -7.802  -7.790  -7.863  -7.816  -7.836  -7.803  -7.773  -7.783  99.999 (-7.790) -7.774
1993  -7.746  -7.727  99.999  -7.746  -7.757  -7.724  -7.772  -7.755  -7.800  -7.773  -7.801  -7.767 (-7.760) -7.769
1994  -7.742  -7.788  -7.812  -7.804  -7.800  -7.780  -7.842  -7.858  -7.847  -7.861  99.999  99.999 (-7.811) -7.795
1995  -7.751  -7.715  -7.803  -7.778  -7.747  99.999  -7.812  -7.835  -7.853  -7.794  -7.822  -7.854 (-7.798) -7.811
1996  -7.803  -7.856  99.999  -7.821  -7.858  -7.901  -7.852  -7.890  99.999  -7.840  -7.867  -7.922 (-7.858) -7.846
1997  99.999  99.999  -7.801  -7.833  -7.824  -7.849  99.999  -7.910  -7.828  99.999  99.999  99.999  99.999  -7.876
1998  -7.937  -7.926  -7.913  -7.946  -7.922  99.999  -7.972  -7.959  -7.977  99.999  99.999  -7.986  99.999  -7.945
1999  -8.014  -8.050  99.999  -7.930  -7.963  -7.963  -7.986  99.999  99.999  -7.997  -7.960  -7.960  99.999  -7.974
2000  -7.978  99.999  -7.969  99.999  -7.955  99.999  -7.999  -7.938  99.999  -7.962  -8.001  99.999  99.999  -7.968
2001  99.999  99.999  -7.943  -7.961  -7.982  -7.947  99.999  99.999  -7.972  -7.986  99.999  99.999  99.999  -7.978
2002  99.999  99.999  99.999  99.999  -8.011  99.999  -8.053  99.999  99.999  -8.060  -8.053  99.999  99.999  -8.023


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.