NEW YORK, Dec. 28 (Xinhua) -- The U.S. dollar weakened on Friday as investors' risk appetite shrank following a week of volatile trading on U.S. stocks market.

Concerns over slowing global economic growth and unstable equities market have dampened investor sentiment in riskier asset classes and pressured the dollar.

The dollar index, which measures the greenback against six major peers, fell 0.07 percent at 96.3965 in late trading.

In late New York trading, the euro fell to 1.1442 U.S. dollars from 1.1450 dollars in the previous session, and the British pound was up to 1.2691 dollars from 1.2647 dollars in the previous session. The Australian dollar was up to 0.7046 dollar from 0.7021 dollar.

The U.S. dollar bought 110.38 Japanese yen, lower than 110.73 Japanese yen of the previous session. The U.S. dollar fell to 0.9856 Swiss franc from 0.9860 Swiss franc, and it fell to 1.3638 Canadian dollars from 1.3640 Canadian dollars.