Senior government posts were reserved for Muslims. Schools set up by Jews, Christians and Zoroastrians had to be run by Muslim principals. Conversion to Islam was encouraged by entitling converts to inherit the entire share of their parents (or even uncle's) estate if their siblings (or cousins) remain non-Muslim. Iran's non-Muslim population has decreased. For example, the Jewish population in Iran dropped from 80,000 to 30,000. The Zoroastrian population has also decreased, due to suffering from renewed persecution and the revived legal contrasts between a Muslim and Zoroastrian, which mirrors the laws that Zoroastrians experienced under earlier Islamic regimes. The view that Zoroastrians are "najis" ("unclean") has also been renewed.