READ lang15; TIME 2015 2075; GENR tsysp1 = @tsysp1*(1-((.001*Y(2015))/(Ssysp1(2015)+Ssysp2(2015)))) $; GENR tsysp2 = @tsysp2*(1-((.001*Y(2015))/(Ssysp1(2015)+Ssysp2(2015)))) $; SIM;