I did this with gemini to so...
I haven't got any experience with, or any paid access to, these LLM things.
Can you get Gemini to give you the figures (since there are only two for each year) and a URL source for those figures, along with the chart? I'm just thinking the output could be specified in a way that made it easy to double-check, and that could be an education, however double-checking turns out.