Would like to know the average number of external visitors per month
per employee for different size businesses.  Small (1 - 35) employees.
 Medium (35 - 5000) Large (20,000).  An external visitor is any
non-employee.  So an employee based in one location visiting an
employee based in another would NOT count.  No problem if data is not
aligned exactly with size of businesses I indicated.    Found one good
example of a data point at this URL
http://www.wisconsin.edu/impact/UWSReport.pdf indicating 24.4 visitors per employee.