* Complete data not available for all years.
Source:American Academy of Arts and Sciences, Humanities Indicators (humanitiesindicators.org). Data for 1992 to 2006 collected by U.S. Census Bureau (Statistics of U.S. Businesses, “SUSB Tables,” http://www.census.gov/programs-surveys/susb/data/tables.html, accessed August 15, 2016). Data for 2007 to 2014 collected by U.S. Census Bureau (American FactFinder, “Geography Area Series: County Business Patterns,”http://factfinder.census.gov/bkmk/table/1.0/en/BP/2014/00A1//naics~44813|44814|448210|451211|4521|453210, accessed 9/15/2016).