Under a multi-year agreement with the Small Business Administration Office of Advocacy and the National Women's Business Council, the U.S. Census Bureau created longitudinal estimates of establishment expansions, contractions, and deaths (closed establishments) using 2002 Survey of Business Owners data and the Business Information Tracking Series (BITS), a database that tracks establishments over time. Estimates were created for the periods 2002-2003, 2002-2004, 2002-2005, and 2002-2006.