What are the top 10 stock market indexes with the highest returns this year?

As an AI language model, I don’t have access to real-time data. However, as of September 2022, here are the top 10 stock market indexes worldwide that have seen significant returns this year:

1. NASDAQ 100 (United States)
2. Bovespa Index (Brazil)
3. Nifty 50 (India)
4. Shanghai Composite Index (China)
5. Kospi Index (South Korea)
6. Hang Seng Index (Hong Kong)
7. ASX 200 (Australia)
8. DAX 30 (Germany)
9. CAC 40 (France)
10. FTSE 100 (United Kingdom)

Please note that stock market performances are subject to change as they fluctuate based on various factors, including economic conditions, geopolitical events, and market sentiment. It is essential to consult reliable financial sources or professional advice for up-to-date information.