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When this happens the S&P remains positive

3:56 PM ET Fri, 21 July 2017

According to our data partners a Kensho, the S&P has gained ten percent or more through the first seven months of a given year twelve times in the last thirty-seven years. When it happens the S&P then trades positively for the remaining five months ninety-one percent of the time. For more Kensho go to CNBC.com/Kensho.