FAIRFIELD, N.J. — Perchloroethylene (perc) consumption in the U.S. drycleaning industry dropped to roughly 20.6 million pounds in 2006, according to the results of an annual survey released by the Textile Care Allied Trades Association (TCATA). That total is less than one-tenth (7.4%) of the perc used in 1985 and almost one-third (32.5%) less than 2005’s 30.5 million pounds.