Beginning In December 1964, Were Published Only Every Other Month. Source: American Bankers Association, "Delinquency Rates On Bank Instalment Loans", (Various Titles), Monthly, 1947-October 1964, Bi-Monthly Thereafter
This NBER data series m09088 appears on the NBER website in Chapter 9 at http://www.nber.org/databases/macrohistory/contents/chapter09.html.
NBER Indicator: m09088
Release: NBER Macrohistory Database
National Bureau of Economic Research, Total Installment Loans, Delinquency Rate, 30 Days and Over for United States [M09088USM156NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M09088USM156NNBR, February 11, 2016.