Japanese yen hold the top spot when it comes to trading with bitcoin (Bitcoin) , that’s 70,98%. At not so close second is U.S. dollar with 19,52%.
It's worth noting that the Chinese yuan now accounts for only 0,07% of trade with BTC. However, back in in december 2016, 98% of all transactions were concluded in yuan. The number tumbled in 2017 once the Chinese government introduced a ban on trading cryptocurrencies due to “financial risks”.