S&P 500 Long-term Price Chart (1971 - Present)
Here is a chart of inflation-adjusted monthly closing prices for the S&P 500 from August 1971 to now. The start date is when the United States went off the gold standard. Price data from ONLINE DATA ROBERT SHILLER.
The chart shows several complete price cycles plus the upside and fledging downside of the current cycle that is now in the making. The black upward-sloping line is the long-term trendline of prices as computed using the standard liner regression model.
Current S&P 500 value of 4,594.63 is 13.82% from the trendline.
More Charts: S&P 1905 - Present   S&P 1982 - Present   NASDAQ Composite Index 1971 - Present