The ten richest percents, the ten next richest etc, in percent of the world's incomes 1950 and 1990 respectively, as per country. The first decentile contains the richest countries up to a tenth of the world population and so on. There has not been any equalization in the world, but not any more inequality either. The poorest have lost somewhat, but so have the richest. The incomes are counted in PPP dollars. Source: Angus Maddison: Monitoring the world economy 1820-1992, OECD 1995.

The figures don't account for living standard, only for wealth and power.

 

 

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