Apparently the rate at which Americans finish college is not improving much. President Obama has announced he wants to lead the world in college completion by 2020 but, according to an article by Daniel de Vise in the Washington Post:
Lumina [Foundation for Education] set a goal in 2008 of increasing the completion rate to 60 percent by 2025. It says it was the first organization to establish this benchmark, which has been taken up in various forms by President Obama and many others.
Available data show that the share of Americans ages 25 to 64 with a two- or four-year college degrees crept up from 37.7 percent in 2007 to 37.9 percent in 2008. At this pace, the graduation rate might reach 46.6 percent in 2025, 23 million grads short of the goal.