Many exchanges seem to fudge their figures in an attempt to look more attractive to traders.  Any stats you read about volume should be taken with a pinch of salt.  There's also no easy way to discern between users who are buying and selling for profit and users who are buying to keep as an investment or to spend on goods and services.  Most exchanges just declare a total volume and don't distinguish between those who withdraws their funds to their own personal wallets versus those who keeps their funds on the exchange in order to day-trade.

In short, no one can tell you with any certainty.