Most are here (about halfway down the page):
http://www.sba.gov/advo/stats/sbfaq.html
How important are small businesses to the U.S. economy?
Small firms
Represent more than 99.7 percent of all employers.
Employ more than half of all private sector employees
Pay 44.5 percent of total U.S. private payroll.
Generate 60 to 80 percent of net new jobs annually.
Create more than 50 percent of nonfarm private gross domestic product (GDP).
Supplied 22.8 percent of the total value of federal prime contracts (about $50 billion) in FY 2001.
Produce 13 to 14 times more patents per employee than large patenting firms. These patents are twice as likely as large firm patents to be among the one percent most cited.
Are employers of 39 percent of high tech workers (such as scientists, engineers, and computer workers ) .
Are 53 percent home-based and 3 percent franchises.
Made up 97 percent of all identified exporters and produced 29 percent of the known export value in FY 2001.
Sources: U.S. Bureau of the Census; Advocacy-funded research by Joel Popkin and Company (Research Summary #211); Federal Procurement Data System; Advocacy-funded research by CHI Research, Inc. (Research Summary #225); Bureau of Labor Statistics, Current Population Survey; U.S. Department of Commerce, International Trade Administration.
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