Nyorai kupfuurira kweiyi ndima - Muna 1993 na2015, kodzero yepakutanga isina muganho yekupotera yakagadziridzwa muzvinhu zvakakosha uye zvakare yakaganhurirwa. Tichifunga nezvedambudziko revapoteri
Muchikamu chechipiri chegore ra2015, shanduko yekodzero yakakosha yekupotera (chikamu 16a GG) yakaitwa vimbiso yechinangwa kuitira kupa nyika mukana wepamutemo wekumisikidza muganho wepamusoro kana quota.