Porter cites a report by Kai Daniel Schmid and Ulrike Stein of the Macroeconomic Policy Institute in Dusseldorf. The report shows the top 10% of Germans having 26% of the country's income before taxes and transfers in 1991. This increased to 31% by 2010. For the same period of about 20 years the bottom half of the population took in 17% in 2010 dropping by 5% from 22%. The growing income inequality in Germany is comparable to what has happened in the U.S. over this period.