Hasbro (Monopoly's owner) does not release annual unit sales for individual titles. "Last year's" exact figure is proprietary. However, we can triangulate from available data:
Industry analysts estimate 5–10 million Monopoly units/year globally across all editions (Classic, themed, junior, digital licenses). Peak years (pandemic 2020–21) likely hit 12–15M; slower years ~4M.
Bottom line: The exact number is a trade secret. For business decisions, use the 5–10M range with wide error bars. For trivia, "over 275 million since 1935" remains the only official cumulative stat.