14-1W\v. Table 14-5 in the text identified all of the U.S. business cycle contractions that have occurred since the end of World War II. The tenth of these recessions began in March 2001 aocording to the National Bureau of Economic Research (NBER). Visit the NBER's Web site at www.NBER.ORG and determine when this research group suggested that the last recession officially ended.