For further information, please refer to the US Census Bureau's Annual Services release, online at http://www.census.gov/services/.
Source: US. Bureau of the Census
Release: Annual Services Survey
US. Bureau of the Census, Expensed Purchases of Other Materials, Parts, and Supplies for Insurance Carriers and Related Activities, All Establishments, Employer Firms [EXPEPMEF524ALLEST], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/EXPEPMEF524ALLEST/, July 30, 2015.