Despite rising over 20% for the year, the performance of U.S. stocks in closing this remarkable year is not very impressive. The S&P 500 index ended the year with four consecutive days of decline, a situation that has not occurred since 1966. Goldman Sachs derivatives trader Brian Garrett believes: The performance in the last two weeks of this year has not been as strong as expected, with short positions increasing trading volume, technical factors dominating, liquidity being challenged, and a healthy pullback in risk appetite just beginning (with increased short positions and decreased net long positions, etc.).