The TOEIC “Report on Test Takers Worldwide” for 2024 is now available. The report is based on responses to a questionnaire given to a total of 3,229,884 people. I think that represents the entire test taking population. The figure is just about identical to 2023 and 2022. It was about 4.8 million in 2019.
Note that ETS overwrites the old PDFs each year a new one gets uploaded. If you want to see old stats, you can start looking for them at the Wayback Machine.