* The U.S. and Australian Real GDP Index(2000=100): 1970q1-2000q4;
data gdp;
      us           aus

      38.301      38.236
      38.373      38.755
      38.714      38.771
      38.299      38.895
      39.362      39.562
      39.584      39.640
      39.897      40.861
      40.011      40.674
      40.722      40.264
      41.684      41.171
      42.081      40.955
      42.770      41.453
      43.856      42.246
      44.363      42.583
      44.127      42.802
      44.549      44.198
      44.162      44.266
      44.290      42.906
      43.861      43.673
      43.689      43.622
      43.166      43.767
      43.482      45.111
      44.218      44.835
      44.798      44.229
      45.807      45.849
      46.148      46.160
      46.369      46.602
      46.701      46.870
      47.265      46.569
      48.193      47.292
      49.056      47.129
      49.051      47.007
      49.209      47.151
      51.148      47.749
      51.653      48.295
      52.332      48.837
      52.434      50.637
      52.484      49.410
      52.862      50.028
      53.018      51.085
      53.187      51.075
      52.113      51.157
      52.026      51.673
      52.991      52.448
      54.065      52.554
      53.643      53.455
      54.292      54.422
      53.615      54.414
      52.736      53.802
      53.020      54.141
      52.819      53.829
      52.866      52.948
      53.518      52.390
      54.725      52.343
      55.806      53.855
      56.947      54.947
      58.061      56.234
      59.060      56.481
      59.635      56.952
      60.125      57.703
      60.680      58.635
      61.198      60.024
      62.155      60.755
      62.633      61.000
      63.232      61.138
      63.482      60.738
      64.090      61.304
      64.413      61.877
      64.837      62.663
      65.550      63.403
      66.145      64.414
      67.300      65.785
      67.629      66.189
      68.489      66.436
      68.854      66.927
      69.763      67.976
      70.471      68.626
      70.933      69.892
      71.439      70.637
      71.620      70.653
      72.447      71.449
      72.633      71.484
      72.638      70.765
      72.089      70.946
      71.721      70.554
      72.186      70.314
      72.535      70.287
      72.875      70.424
      73.630      71.101
      74.340      71.149
      75.069      71.990
      75.896      73.157
      75.988      74.014
      76.373      74.434
      76.765      74.296
      77.798      75.888
      78.590      77.322
      79.614      78.257
      80.061      79.195
      80.999      79.473
      81.224      80.048
      81.370      80.731
      82.033      81.909
      82.633      82.495
      83.215      83.859
      84.579      84.344
      85.288      85.146
      86.286      86.092
      86.953      86.138
      88.274      88.318
      89.373      88.701
      90.032      89.754
      91.028      91.014
      91.630      91.708
      92.686      93.157
      94.093      94.844
      94.892      95.411
      95.677      96.458
      96.794      96.829
      98.514      98.448
      98.764      99.277
     100.315     100.438
     100.200     100.604
     100.721      99.681