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In the past 50 years, college graduation rates in developed countries have increased nearly 200 percent, according to Education at a Glance 2011, a recently published report by the Organization for Economic Co-operation and Development. The report shows that while education has improved across the board, it has not improved evenly, with some countries enjoying much greater rates of educational attainment than others. Based on the report, 24/7 Wall St. identified the 10 developed countries with the most educated populations.