Transactions involving major cryptocurrencies in Japan soared roughly 20-fold in fiscal 2017 from the previous year to 69 trillion yen ($645 billion), an industry body said Tuesday.

The data on five major cryptocurrencies including bitcoin traded at 17 digital currency exchanges showed that of the 69 trillion yen, 56.4 trillion yen resulted from margin trading and the rest from cash trading.

Bitcoin dominated over 90 percent of total cryptocurrency transactions and most traders were in their 20s to 40s, according to the data.

The Financial Services Agency, which regulates cryptocurrencies in Japan, said in March it would set up a panel to discuss an appropriate system for trading, following a massive digital money theft from Coincheck Inc. in January.

The data were released during a meeting at the agency of an industry group recently established by 16 digital currency exchange operators.