Dickey-Fuller test for unit root                   Number of obs   =        21

                               ---------- Interpolated Dickey-Fuller ---------
                  Test         1% Critical       5% Critical      10% Critical
               Statistic           Value             Value             Value
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 Z(t)            -14.272            -4.380            -3.600            -3.240
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MacKinnon approximate p-value for Z(t) = 0.0000

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D.TotalS     |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
      TotalS |
         L1. |  -.9774459   .0684873   -14.27   0.000    -1.121332   -.8335593
      _trend |   .4713369   .0326362    14.44   0.000     .4027708     .539903
       _cons |   48.50135   3.370879    14.39   0.000     41.41939     55.5833
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