MODELS of GNP*  
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   BULGARIA:        97.8 - 0.187 * T + 15.531 * sin(0.564 * T)

   CZECH REP.:	    99.9 - 0.966 * T +  9.332 * sin(0.680 * T)

   HUNGARY:	    97.7 - 0.038 * T + 10.037 * sin(0.607 * T)

   POLAND:          97.9 + 0.674 * T + 11.051 * sin(0.669 * T)

   ROMANIA:	    99.3 - 2.865 * T + 12.629 * sin(0.601 * T)

   RUSSIA:	    95.7 - 1.106 * T + 22.437 * sin(0.465 * T)

   Model for
   Common Trend:    98.0 - 0.558 * T + 13.319 * sin(0.580 * T)
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 *  T - parameter of time; T=0,1,2,...