Extra Digits Are From Worksheets. Averages: 1919-1928=1368.6; 1929-1938=-53.1; 1919-38=657.8 Source: Simon Kuznets, National Income And Its Composition, 1919-1938, (NBER), P. 276
This NBER data series a10057 appears on the NBER website in Chapter 10 at http://www.nber.org/databases/macrohistory/contents/chapter10.html.
NBER Indicator: a10057
Release: NBER Macrohistory Database
National Bureau of Economic Research, Savings of Government for United States [A10057USA144NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A10057USA144NNBR, February 11, 2016.