The Uncommon Average Since 1926, the US stock market has returned 10% a year on average, but the road to 10% has been bumpy. Returns in any given year have ranged from as high as 54% to as low as -43%. In fact, the S&P 500 had a return within plus or minus 2% points of this 10% average in only 6 of the past 95 calendar years. This uncommon average of the stock market is similar to the uncommon average associated with LeBron James. LeBron has averaged 27 points, 7 assists, and 7 rebounds a game during his entire …