Annual GDP-by-industry estimates based on the 1997 North American Industry Classification System (NAICS) are available for 1947 and forward; annual industry estimates based on the Standard Industrial Classification (SIC) system are available for 1947-1997. The annual input-output (I-O) accounts estimates, consistent with the GDP-by-industry accounts and classified using NAICS, are available for 1998 and forward.
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