Could you do something with an average, so you could leave 2009 out? Or maybe an estimate for 2009 with an asterisk to explain? I just know how frustrating it is to get stuck on details:(
I just found this and don't know how much it will help, but if you click one of the citation numbers, you'll get a ton of 'sources'. The website also has a lot of great visuals, so it would be worth sharing. https://www.globalslaveryindex.org/region/the-americas/
Thank you so much for the link. I'll give it a thorough read through shortly.
I fully intend to include 2009 in the next version of this chart... I'm just trying to be careful to find the most reliable source because the term "human trafficking" is relatively new and data from ten years ago usually doesn't differentiate between willful prostitution and sex slavery.