From an August 2007 article in Inc. magazine:
Businesses with fewer than 20 employees account for 90 percent of all U.S. firms and are responsible for more than 97 percent of all new jobs, according to a new report by the Small Business Administration.
Small Business Administration: Businesses with fewer than 20 employees create more than 97 percent of all jobs
From an August 2007 article in Inc. magazine: