The industrial production (IP) index measures the real output of all relevant establishments located in the United States, regardless of their ownership, but not those located in U.S. territories.
NAICS = 211111pt.
Source Code: IP.N211111G.S
Board of Governors of the Federal Reserve System (US), Industrial Production: Mining, Quarrying, and Oil and Gas Extraction: Natural Gas (NAICS = 211111pt.) [IPN211111GS], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/IPN211111GS, May 14, 2021.