Averages of daily figures. Series is price adjusted. A weighted average of the foreign exchange value of the U.S. dollar against a subset of the broad index currencies that circulate widely outside the country of issue.
Major currencies index includes the Euro Area, Canada, Japan, United Kingdom, Switzerland, Australia, and Sweden. For more information about trade-weighted indexes see http://www.federalreserve.gov/pubs/bulletin/2005/winter05_index.pdf.
Board of Governors of the Federal Reserve System (US), Real Trade Weighted U.S. Dollar Index: Major Currencies [TWEXMPA], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/TWEXMPA/, October 9, 2015.