Ngasekupheleni kwawo-1990, kwenziwa izifundo eziningana ukuze kuhlolwe ukunemba kwabangewona ochwepheshe, abaphenduli bokuqala, abezimo eziphuthumayo kanye nodokotela ngisho nokuhlola ukuba khona kwe-pulse kuphela.Kolunye ucwaningo, izinga lokuphumelela lokuqashelwa kwe-pulse laliphansi njenge-45%, kanti kolunye ucwaningo, odokotela abancane ...
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