(Bloomberg) -- U.S. equities are being pushed along by the fewest stocks in more than 15 years, a sign of fatigue in a bull market that already rivals anything since World War II in duration.

More than 100% of this year's increase in the Standard & Poor's 500 Index is attributable to two sectors, health-care and retail. That's the tightest clustering for an advancing year since at least 2000, data compiled by Bloomberg show.

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