On Monday morning, Uber cofounder and CEO Travis Kalanick announced the ridesharing startup reached two billion total trips completed on its platform last month. The milestone comes less than six months after Uber hit one billion cumulative rides at the end of 2015–a feat that took Uber more than five years to accomplish. Completing a billion trips in the first half of this year shows remarkable growth following Uber’s last few years of rapid expansion into many countries around the world. While Uber did 140 million rides in all of 2014, it is likely on pace to surpass two billion rides in 2016, bringing the total number to over three billion trips by the end of the year. In his announcement, Kalanick said the company would ”hopefully reach our third [billion] even more quickly.”