Distribution of currencies (by volume traded)

The US dollar is the most heavily traded currency. It takes part in about 86% of all forex trades. The share of the euro is about 37% while the yen takes the third place with some 17%.

GBP (British pound) - 15%
CHF (Swiss franc) - 7%
AUD (Australian dollar) - 7%
CAD (Canadian dollar) - 4%
SEK (Swedish krona) - 3%