data =[
  317.5898   61.1431
  318.9410   62.3397
  318.9646   64.1237
  320.6136   65.8040
  319.1430   65.7448
  322.9780   66.7592
  327.4960   68.7203
  334.0270   70.4817
  338.9380   71.9330
  343.4040   73.5567
  347.7490   74.9117
  350.9580   76.1559
  355.0920   78.3241
  359.6260   79.8464
  363.5270   81.7701
  362.1050   82.7481
  360.5490   83.9822
  358.4020   85.1421
  355.1970   89.7211
  355.1810   91.1453
  354.5830   95.2291
  354.5830   95.9784
  353.0410   98.1540
  352.2150   97.9903
  351.4630   98.0731
  353.6130   98.2742
  356.9350   99.2821
  359.0320   99.9394
  362.0870  101.6911
  364.8510  101.9328
  368.1530  103.2393
  372.1940  104.1747
  374.7810  105.9697
  376.8580  107.1838
  379.2970  108.9103
  381.6900  108.8058
  383.5770  109.9109
  384.6710  109.6417
  385.6150  109.6060
  388.3580  109.3911
  392.5010  109.5357
  395.5670  109.7281
  398.2520  109.5834
  400.8620  110.2893
  406.0014  112.1034];

GDP = data(:,1);  % hruby domaci produkt
CPI = data(:,2);  % index spotrebitelskych cen

t = (1993+1/4:1/4:2004+1/4)';