• End of period
• Additional: 13 years
• Now: January 1937
• Average of period
• Additional: 61 years
• Now: January 1885

The series reside in the historical catalog (United States » Equity markets » S&P Dow Jones Indices » Summary) and are:

• SP500EM.IUSA = Stock Price Index: S&P 500, (Index 1941 to 1943=10 EOP, NSA)
• SP500AM.IUSA = Stock Price Index: S&P 500, (Index 1941 to 1943=10 AVE, NSA)