A 2008 poll conducted jointly by INED and the French National Institute of Statistics estimated that the largest ancestry groups were Italian (5 million), followed by Northwest African (3-6 million), Sub-Saharan African (2.5 million), Armenian (500,000), and Turkish (200,000). There are also sizable minorities of other European ethnic groups, namely Spanish, Portuguese, Polish, and Greek. France has a significant Gitan (Romani) population, numbering between 20,000 and 400,000; many foreign Roma are expelled back to Bulgaria and Romania frequently.