Global foreign exchange has always been one of the biggest markets in the world but its exponential growth keeps accelerating. The triennial survey by the Bank for International Settlements shows global foreign exchange market turnover leapt 20 percent to $4 trillion, compared with $3.3 trillion three years ago.

FXBIS

The increase in turnover was driven by growth in spot transactions, which represent 37 percent of FX market turnover.  Turnover was driven by trading activity by "other financial institutions" -- a category that includes hedge funds, pension funds and central banks, extending a trend seen in the past several years where buyside firms are increasingly trading currencies themselves, via prime brokerage, rather than turning to interbank dealers.

Also notably, emerging market currencies are gradually increasing their share in the marketplace. Turnover of the Russian rouble has increased its share in total turnover to 0.9 percent of 200 percent (FX is double counted as transaction involves two currencies), up from 0.7 percent three years ago, while the Brazilian real rose to 0.7 percent from 0.4 percent. The Indian rupee's share rose to 0.9 percent from 0.7 percent. The dollar keeps its dominance, although off its 2001 peak, with its share standing at 84.9 percent.