Source:
Rolling back the years
The Economist online Feb 23rd 2012, 14:35
http://www.economist.com/blogs/graphicdetail/2012/02/daily-chart-15
Rolling back the years
The Economist online Feb 23rd 2012, 14:35
http://www.economist.com/blogs/graphicdetail/2012/02/daily-chart-15
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