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How to get a pareto distribution on world income over time.

In one of Mr. Rosling's talks he uses a graph, that shows income per person and day for the whole world an how much percent of the total income the top and bottom 20% of the people of the world are making. i can't reproduce this graph, could some help? i would like to find out, if the rich got richer and the poor pooer over the last 50 years. I here that all the time and want to know, if data supports this. sorry for less than optimal english.
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