The Romanian diaspora is the ethnically Romanian population outside Romania and Moldova. The concept does not usually include the ethnic Romanians who live as natives in nearby states, chiefly those Romanians who live in Ukraine, Hungary, Serbia, and Bulgaria. Therefore, the number of all Romanians abroad is estimated at 4–12 million people, depending on one's definition of the term "Romanian" as well as the inclusion respectively exclusion of ethnic Romanians living in nearby countries where they are indigenous. The definition of "who is a Romanian?" may range from rigorous conservative estimates based on self-identification and official statistics to estimates that include people of Romanian ancestry born in their respective countries as well as people born to various ethnic-minorities from Romania. As of 2015/16, over 97% of Romanian emigrants resided in OECD countries; and about 90% of Romanian emigrants in OECD countries lived in Europe, with the most common country of residence being Italy. The vast majority of Romanian emigrants are based in just ten countries, with the most common countries being Italy, Germany, Spain, United Kingdom, United States, Hungary, France and Canada.