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, Defined Benefit Pension Plans for Cable and Other Subscription Programming, All Establishments, Employer Firms [EXPDBPEF5152ALLEST], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/EXPDBPEF5152ALLEST/, July 28, 2015.