3.Japan: In this country, around 44 percent of the adults have some form of postsecondary education. When we compare to this percentage, the United States percent has gone down, as it is just up to 41 percent. When you consider the population growth of Japan, it has just increased up to 0.46 percent between the year 2000 and 2009, which is considered as the sixth slowest growth rate in the OECD. Japan along with Finland is the third highest upper-secondary graduation rate in the world with 95 percent.