This foreign exchange transaction amount is calculated by the foreign exchange clearing institution. Because the number is very large, it is generally not calculated in years, but the word "daily average". The data you want is old, so it is difficult to find the specific figures now. The following is an excerpt from the report of 20 10. You can have a look and hope it will help you:

"The Bank for International Settlements conducts statistics on foreign exchange transactions every three years. The last time the bank released a similar report was in 2007, when the average daily foreign exchange turnover for three years was 3.3 trillion US dollars. This means that the average daily foreign exchange transaction volume has increased by 20% in the last three years, but this speed is still less than the 72% increase in the last statistical cycle from 2004 to 2007. "

"Morning news on July 27th, Beijing time, according to foreign media reports yesterday, according to the semi-annual survey reports published by central banks on their respective websites, compared with last year's 10, the foreign exchange trading volume increased significantly in April, because the sovereign debt crisis in the euro zone played a role in pushing up the trading volume.

Mark McDonald, an analyst at HSBC Holdings Plc in London, said that according to central bank data, the average daily trading volume of the global foreign exchange market has risen from $3.2 trillion in 2007 to more than $ 4. 1 trillion. According to the April survey report released by the Federal Reserve of new york, the average daily trading volume of the US foreign exchange market was $754 billion, an increase of 10/2% over the previous year; In the same period, the average daily trading volume of the British foreign exchange market was $65,438 +0.75 trillion, an increase of 15% over the same period last year. "

If you really can't find the specific figures, you can also take the daily average of 4. 1 trillion as your data.