Every year the U.S. Department of State puts out a Trafficking In Persons Report. This report includes trafficking statistics and overall status for the previous year in EVERY country! This is an incredible global effort to understand the scope of the issue of human trafficking around the world.
The report is lengthy because it gives each country a rating according to how well their government is working to fight the injustice of human trafficking. You can search by country of interest, or gather an overall look at the world. This is a phenomenal resource and the latest report can be found here: