The actual source is Milanovic&#x27;s book (which you&#x27;d know if you read the NYT article), but that&#x27;s $12 on kindle: <a href="http:&#x2F;&#x2F;amzn.to&#x2F;1VSdMU5" rel="nofollow">http:&#x2F;&#x2F;amzn.to&#x2F;1VSdMU5</a><p>I spent a few minutes googling hoping to find something academic by the same author, but didn&#x27;t look as carefully as I should have.<p>But since you&#x27;ve called me out, I dug up my copy of the book. Apparently this paper is the original source and it uses 2005 data: <a href="https:&#x2F;&#x2F;www.gc.cuny.edu&#x2F;CUNY_GC&#x2F;media&#x2F;CUNY-Graduate-Center&#x2F;PDF&#x2F;Centers&#x2F;LIS&#x2F;Milanovic&#x2F;papers&#x2F;2012&#x2F;gpol_170.pdf" rel="nofollow">https:&#x2F;&#x2F;www.gc.cuny.edu&#x2F;CUNY_GC&#x2F;media&#x2F;CUNY-Graduate-Center&#x2F;P...</a><p>No idea where to get the most current data.