On August 8, Ford celebrated the construction of its 10-millionth Mustang (including production for markets worldwide), a Wimbledon White GT convertible with a black interior, matching the features and colors of the first serialized Mustang (VIN 001), produced in 1964. Over the 54 years of production — that works out to be an average of 185,185 Mustangs built per year — which of the car’s six generations, however, proved most popular with buyers, and by how large a margin?

Launched in April 1964, the Mustang was an instant hit with consumers, selling 680,989 examples through its first full model year on the market, 1965. Early model years were – by far – the most successful, with 607,568 sold in ’66, followed by another 472,121 in ’67. To put those numbers in perspective, the perennially most-popular car in the United States, Toyota’s Camry, sold to 388,616 consumers in 2016 and 387,081 consumers in 2017. (Sadly, even the early Mustang is no match for Ford’s F150, of which 896,764 were sold in 2017 and 820,799 were sold in 2016.)

Ten million of one model. Few cars have the legacy of this ageless pony car.