Source: Life Insurance Association Of America, Data For 1952-1963: Mimeographed Summary Table On "New Commitments Of Reporting Life Insurance Companies"; Data For 1964-1965: Monthly Tabulation Of "Forward Investment Commitments Of Life Insurance Companies"
This NBER data series m10169 appears on the NBER website in Chapter 10 at http://www.nber.org/databases/macrohistory/contents/chapter10.html.
NBER Indicator: m10169
Release: NBER Macrohistory Database
National Bureau of Economic Research, New Commitments For Future Investment of Life Insurance Companies, Nonfarm Residential Mortgages, Conventional for United States [M10169USM144NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M10169USM144NNBR/, June 30, 2015.