The fact that Asian currencies make up only 3% of total foreign-exchange reserves indicates how far Asia still lags in financial matters.

ECONOMIST: The balance of economic power

Now China has much of its foreign exchange in U.S. treasury bonds, part of a total reserve worth over a trillion dollars.

NPR: Chinese Cash Moves Could Roil Markets

In fact, interventions do not have to match the total, or even a significant part, of all transactions conducted on the foreign-exchange market to be effective, but only the ex ante imbalances in these transactions.

ECONOMIST: Interventionist