The BIS Triennial Central Bank Survey provides news and statistics about the size and structure of global foreign exchange (FX) and over-the-counter (OTC) derivatives markets since 1986. Currency market data for the year 2019 we can see in OTC derivatives outstanding Report
Based on statistics, we can see how much money circulates in the forex every year.
How much forex is traded daily?
According to the Bank for International Settlements triennial report of 2019, the foreign exchange market cap averaged $6.6 trillion per day ($6.6 trillion daily foreign exchange volume). In 2016. it was 5.1 trillion per day. So, the forex is the most actively traded market globally, and more than $6 trillion are traded on average every day. By comparison, this volume exceeds global equities trading volumes by 20-30 times.
More than 1,200 financial institutions in 53 countries contributed to the 2019 Triennial Survey. The final results are being published every December.
See below full statistics based on bis.org research: