According to Roberto Bachi, head of the Israeli Institute of Statistics from 1949 onwards, between 1922 and 1945 there was a net Arab migration into Palestine of between 40,000 and 42,000, excluding 9,700 people who were incorporated after territorial adjustments were made to the borders in the 1920s. Based on these figures, and including those netted by the border alterations, Joseph Melzer calculates an upper boundary of 8.5% for Arab growth in the two decades, and interprets it to mean the local Palestinian community's growth was generated primarily by natural increase in birth rates, for both Muslims and Christians.[114]
