Most prostitutes are estimated to be foreigners.
In the 1970s, the majority of foreign prostitutes were from Thailand and the Philippines, in the 1980s from Latin America and the Caribbean. After the fall of the Berlin Wall, many prostitutes came from Central and Eastern Europe. No more than one third were Dutch nationals, the remainder representing 44 nationalities. The majority were from the Dominican Republic, Colombia, the Czech Republic, Romania and Poland. 
An article written by Marie-Victoire Louis in Le Monde diplomatique in 1997, claimed that 80% of prostitutes in Amsterdam were foreigners and 70% had no immigration papers (but did not quote the source). 
In 2000, the Ministry of Foreign Affairs estimated that approximately 32% of all prostitutes were Dutch, 22% were Latin American, 19% were Eastern European, 13% were African , 6% came from other countries from the European Union (aside from the Netherlands), 5% came from Northern Africa and 3% were Asian.
In 2008, Karina Schaapman, a former prostitute and former member of the Amsterdam city council, produced a report about the Amsterdam sex trade. She offered the police a face book with 80 "violent pimps", of whom only three were Dutch-born. She said that more than 75% of Amsterdam's 8,000 to 11,000 prostitutes were from Eastern Europe, Africa and Asia.
A study released by TAMPEP in 2009 put the number of migrant prostitutes at 60% (a decrease from 70% in 2006), originating from: Central Europe (EU) 40%, Latin America 20%, Western Europe 12%, Eastern Europe (non-EU) 8%, Africa 8%, Balkans 4%, Asia 4%, Baltic states 3% (estimates for 2008).