 Apart from economic growth, another factor contributing to the population increase is Philadelphia's rising immigration rate.Like the millennial population, Philadelphia's immigrant population is also growing rapidly.According to research by The Pew Charitable Trusts, the city's foreign-born population had increased by 69% between 2000 and 2016 to constitute nearly 20% of Philadelphia's work force, and had doubled between 1990 and 2017 to constitute 13.8% of the city's total population, with the top five countries of origin being China by a significant margin, followed by the Dominican Republic, Jamaica, India, and Vietnam.