Thanks to the German forum on line http://www.sexworker.at/ which has done this graphic with the figures from the Federal German police about trafficking and pimping in this country.
These figures represent the number of people who have been identified by the German police and not an overall estimation of the problem. In comparison, the UK doesn’t have such figures but only an estimation from the Association of Chief Police Officers (ACPO) of the number of trafficking victims in the UK: 2.600
See their report here: http://www.acpo.police.uk/documents/crime/2010/201008CRITMW01.pdf
We don’t know how many sex workers there are in the UK but a number of 80.000 was given for female sex workers working on the streets and flats identified by health projects. I believe we are probably at least twice more if we take into account all the sex workers who advertise on line.