Estimates made by Soviet scientists suggest that this percentage will have increased to 30 % to 40 % by the end of the 1980s and that by the year 2000 it may have risen to as much as 40 % to 50 %.
Uqikelelo olwenziwa sizazinzulu zase Soviet sabonisa ukuba ipesenti iyakube yonyukile ukuya ku 30% ukuya kwi 40% ukuphela 1980 nokuya ngonyaka ka 2000 isenokunyuka ukuya ku 40% ne 50%.