If we exclude the extreme values of these forecasts and take the average values, a comparison with the results that were actually achieved in 1975 and 1980 clearly shows the questionable nature of forecasts of this type.
Ukuba sikhetha ixabiso eligqithisileyo lwengxelo ezingaphambili uthathe umdilili wexabiso, uthelekiso lweziphumo eziphunyezwe ngo 1975 nango 1980 cacileyo zibonise indaba ethandabuzekayo lohlobo lwengxelo engaphambili.