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The idea behind the Social Progress Index is that the traditional ways of measuring country progress, such as GDP, don't capture everything that a country might do (or not do) to improve the lives of its citizens (read more on that here). The 2015 version was published the month of April, you can find it on this link and here's a chart that shows how the LatAm/Carib countries on the 133 name roster have scored:
Uruguay and Chile regularly top these surveys when it comes to the LatAm region, so no surprises there. Costa Rica has that happy thing going on, Argentina scores higher than on straight GDP measurements (due to the amount of State coverage for its citizens, perhaps) and the LatAm average score is 67.64, so all countries from Mexico onwards fall below the line.