Friday marks the 25th anniversary of Black Monday when the S&P 500 fell more than 20% in a single trading session. From the day following the crash through Oct. 18, 2012, U.S. stocks – measured by the S&P 500 index – have posted annualized total returns of 9.7%. Gains have not come without volatility though, as the index's annualized standard deviation of returns has been 17.2% during the same time. By comparison, the Barclay's Capital U.S. Aggregate Bond index had annualized returns of 7.3% with a standard deviation of 4% during the same period.