One of the references http://www.economist.com/blogs/graphicdetail/2015/04/daily-chart-2 http://www.economist.com/blogs/graphicdetail/2015/04/daily-c... has bot

One of the references http://www.economist.com/blogs/graphicdetail/2015/04/daily-chart-2 http://www.economist.com/blogs/graphicdetail/2015/04/daily-c... has both. There are some differences.