Chipotle Mexican Grill’s Latest Year unit increase of 11.6 percent, to 1,755 U.S. units, not only ranked it No. 8 among all Top 100 chains, but also made it No. 2 among the 19 chains that do not franchise. It fell behind fully company-owned Yard House, which had a 13.5-percent unit increase, to 59 restaurants. Since 2000, Chipotle has had average annual growth in U.S. units of 33.7 percent. Its Latest-Year, 183-unit expansion was the sixth largest net gain among all Top 100 chains, and more than twice that of closest company-operated competitor Casey’s General Stores.