Dickey-Fuller test for unit root                   Number of obs   =        21
    
                                   ---------- Interpolated Dickey-Fuller ---------
                      Test         1% Critical       5% Critical      10% Critical
                   Statistic           Value             Value             Value
    ------------------------------------------------------------------------------
     Z(t)            -14.272            -4.380            -3.600            -3.240
    ------------------------------------------------------------------------------
    MacKinnon approximate p-value for Z(t) = 0.0000
    
    ------------------------------------------------------------------------------
    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
    ------------------------------------------------------------------------------