The Globe and Mail reports in its Tuesday edition May of 2011 was a watershed moment, when market trends turned negative and the domestic equity market's long-term performance advantage over the S&P 500 began to evaporate. The Globe's Scott Barlow advises Canadian investors to move portfolio assets out of domestic equities and into stable S&P 500 stocks. From September, 2004, to May, 2011, the Canadian market outperformed significantly. On May 30, 2011, the Toronto Stock Exchange investment was worth $1,663 and the S&P 500 position was actually under water (less than $1,000) by almost 10 per cent. From there, everything changed. Between May, 2011, and now, the S&P 500 has outperformed the S&P/TSX composite by more than 50 per cent in Canadian dollar terms. A look at the best and worst performing S&P 500 market sectors since our watershed moment explains why this happened. Many of the top performing sectors -- biotech, health care, housewares, distillers and entertainment -- were U.S. industries with little or no representation in the Canadian market. The four S&P 500 sectors with the worst performance were coal, gold miners, diversified miners, and oil and gas drillers.