Source: Life Insurance Association Of America, Data For 1952-1960 Are From Association Files; Data For 1961-1967 Are From The Monthly Release, "Forward Investment Of Commitments Of Life Insurance Companies"
This NBER data series m10127 appears on the NBER website in Chapter 10 at http://www.nber.org/databases/macrohistory/contents/chapter10.html.
NBER Indicator: m10127
Release: NBER Macrohistory Database
National Bureau of Economic Research, New Commitments for Future Investment of Life Insurance Companies in Business and Industrial Mortgages. for United States [M10127USM144NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M10127USM144NNBR, April 29, 2016.