National Savings Rate is the percentage of GDP that is saved by households across a country. Household saving is one of the primary sources of capital investment in the country. Thus, this rate can be used as an indicator for long term economic growth.
The graph above shows the historical trend in savings rate in developed countries. The differences in the rates occur due to the age of the working population, the amount of old age pension and insurance provided by the government. The age of the population is significant because the older and retired use their savings more than the younger, working population. Moreover old age pension and insurance provided by the state allows the population to spend rather than save more.
The Bureau of Economic Analysis publishes the Personal Savings rate as a National Economic Indicator on a quarterly basis.