Photographer: Scott Eells/Bloomberg

The Year That Investors Lost Their Appetite for Chipotle: Chart

Chipotle Mexican Grill Inc., pummeled by E. coli and norovirus outbreaks this year, was the worst-performing stock in the restaurant index of the Standard & Poor’s 500 in 2015. Starbucks Corp., which used technology and a greater emphasis on food to drive growth, had the group’s best year.

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