The 1934 Figure Is The Average Of Two Figures. See Page 321 Of The Source For An Explanation. Source: Simon Kuznets, National Income And Its Composition, 1919-1938, Volume I, 1941, Pp. 322-323, Table 57.
This NBER data series a08169aa appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: a08169aa
Release: NBER Macrohistory Database
National Bureau of Economic Research, Aggregate Payments To Individuals for United States [A089AAUSA144NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A089AAUSA144NNBR/, September 4, 2015.