Standard & Poor's Quantitative Services Group has released its updated S&P 500 quarterly historical total return value through December 31, 2007.
From January 1926 through December 2007 the annualized total return for the S&P 500 was 10.43% per year vs. 10.51% for September 2007. The dividend component consists of 40.59% of the return vs. 40.37% for September 2007. The annualized return consists of both capital appreciation and dividends reinvested.