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Current Index: 200.21
Index for Oct 2017
Mean: 150.98
Median: 141.62
Min: 74.67 (Dec 1919)
Max: 231.03 (Dec 2005)

US national index levels, not seasonally adjusted. Historic prices are inflation adjusted September, 2018 dollars.

Data is courtesy Robert Shiller, from his book, Irrational Exuberance, and Standard and Poor’s.