The problem with that is that it depends on what you measure (same with GDP if e.g. education is free). E.g. Germany and Switzerland have different branches in education that are well regarded but you don't go to university (e.g. nurses go to university in the US and thus count in your statistic but in Germany they get a special multi-year training which is not counted)
Canada - 54%
Japan - 48%
U.S. - 44%
Switzerland - 40%
Sweden - 39%
Estonia - 38%
Iceland - 37%
Belgium - 37%
France - 32%
Germany - 27%