The U.S. Census Bureau began publishing seasonally adjusted constant dollar merchandise trade data in January 1990. The constant dollar series was created to meet the requirements of the Omnibus Trade and Competitiveness Act of 1988. Census replaced its fixed-weighted constant dollar series with a chained-dollar series with the release of the April 2003 issue of the U.S. International Trade in Goods and Services (FT-900), on June 13, 2003. We adopted this methodology to improve the quality of the constant dollar series and for consistency with other official government statistics released by the Department of Commerce. Users are reminded, however, that the Census constant dollar series will not match BEA's constant dollar series because of the underlying coverage differences between the current dollar National Income and Product Accounts (NIPA) and Census data. See Real Dollars.