The U.S. exhibition industry overall declined 12.5 percent last year, according to a survey conducted by the Center for Exhibition Industry Research. The drop is four times greater than the largest previous loss, 3.1 percent in 2008. Conducted since 2004, the CEIR Index report measures year-over-year changes in four key areas: net square footage, revenue, professional attendance and number of exhibiting companies. The measurements are taken in 11 industry sectors: professional business services; consumer and retail trade; sports and entertainment; food; government; building and construction; industrial and manufacturing; communications and information technology; medical and health care; raw materials and science; and transportation. The survey is based on information gathered from more than 300 events held in the United States, where participants fill out CEIR's survey data forms; Veris Consulting calculates and analyzes the information for CEIR. The full survey will be released April 12 and will be available for purchase at ceir.org.