According to research carried out in 1996 on human resources services, almost 9 out of 10 workers were recruited by posted employment agencies. In addition, according to statistics from the America Staffing Association, 90% of U.S. businesses used the services of the employment industry. This showed how deeply rooted the concept of sending work was in American society. In Japan, since the adoption of the Posting of Employment Act in 1985, the employment service has grown rapidly, leading to the development of 615 general employment agencies, 3,266 specific posted employment agencies and 1.4 billion posted workers. At that time, sending labor became popular in America, Japan, and throughout Europe. The largest and most frequent work show in America was founded from 1946 to 1951. This is how Manpower, the largest employment agency, was created in 1948.