Data related to historical savings rates from 1960 to 2015 in the United States are available from TradingEconomics.com and from the Federal Reserve Bank of St. Louis. Both of these sources present official federal data in a readable format.
The Research Division of the Federal Reserve Bank of St. Louis monitors and produces economic research data. The bank provides this data to the public, including personal savings rate data, via the FRED system. The data is also available from TradingEconomics.com, which provides economic data from the United States as well as several other countries. Official data on the public savings rate and other economic indicators are collected by the Bureau of Economic Analysis in the United States Department of Commerce.