I don't know if we're veering too far off topic but here are some links to human trafficking info.
http://en.wikipedia.org/wiki/Human_trafficking
The most common destinations for victims of human trafficking are Thailand, Japan, Israel, Belgium, the Netherlands, Germany, Italy, Turkey and the US, according to a report by the UNODC (United Nations Office on Drugs and Crime).[39]
Netherlands
In Netherlands, it is estimated that there are from 1,000 to 7,000 trafficking victims a year. Most police investigations relate to legal sex businesses, with all sectors of prostitution being well represented, but with window brothels being particularly overrepresented.[88][89][90] In 2008, there were 809 registered trafficking victims, 763 were women and at least 60 percent of them were forced to work in the sex industry. All victims from Hungary were female and were forced into prostitution.[91][92] Out of all Amsterdam's 8,000 to 11,000 prostitutes, more than 75% are from Eastern Europe, Africa and Asia, according to a former prostitute who produced a report about the sex trade in Amsterdam, in 2008.[93] An article in Le Monde in 1997 found that 80% of prostitutes in the Netherlands were foreigners and 70% had no immigration papers.[94][95]
http://www.catwinternational.org/factbook/Netherlands.php
In Amsterdam, Netherlands, 80% of prostitutes are foreigners, and 70% have no immigration papers, suggesting that they were trafficked. (Marie-Victoire Louis, "Legalizing Pimping, Dutch Style," Le Monde Diplomatique, 8 March 1997)
In the Netherlands, 33% of the prostitutes come from countries outside of the European Union, this increases to 50% in the larger cities (Altink, 1995) ("Trafficking of Women to the European Union: Characteristic, Trends and Policy Issues," European Conference on Trafficking in Women, (June 1996), IOM, 7 May 1996)
Since 1990 in the Netherlands, the number of trafficked women from Central and Eastern European Countries has tripled. ("Trafficking of Women to the European Union: Characterisitics, Trends and Policy Issues," European Conference on Trafficking in Women, (June 1996), IOM, 7 May 1996)