4.1. Income Levels over Time

The figures below show the regional trend of fractiles AI90-95, AI95-99, and AI99-100 for the entire time period. The regional data were obtained by taking the average values of the states in that region. The state recording the highest level of income for fractile AI99.99-100 is also displayed. Throughout the 91 years of observations, the peak income of the top 0.01 percent (AI99.99-100) exceeds by 23 times the maximum value of the top percentile (AI99-100) in the Midwest, and 37 times in the West.