Source: Simon Kuznets, National Product Since 1869 (NBER), 1946, Table I-5, P. 35.
This NBER data series a06083 appears on the NBER website in Chapter 6 at http://www.nber.org/databases/macrohistory/contents/chapter06.html.
NBER Indicator: a06083
Release: NBER Macrohistory Database
National Bureau of Economic Research, Consumer Outlay, Services, In Current Prices for United States [A06083USA144NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A06083USA144NNBR/, June 2, 2015.