Japan's Financial Services Agency (FSA) released domestic cryptocurrency trading statistics for the first time. Data points to 3.5m active traders, yearly trading volume of bitcoin of $97b in 2017 (up from $22m in 2014) and even more staggering, trading on margins, credit and futures of bitcoin as an underlying asset has surged from just $2m in 2014 to $543b in 2017. Source document in Kanji is here