Check a ranking of the best-performing equity indexes this year and the U.S. doesn’t crack the Top 10. You won’t find it in the Top 25, either. Double that, and the S&P 500 is still absent. The tally needs to unfurl all the way to 66 before the world’s most valuable equity index shows up — leaving it way behind Greece’s Athex and even Israel’s TA-35. It’s one of the worst relative performances since the global financial crisis for the U.S. benchmark. The underperformance is even more surprising