U.S. family income distribution 1990-2016, by Gini coefficient

The data displays the Gini coefficient, an index for measuring income distribution, for U.S. families from 1990 to 2016. A Gini coefficient of 0 expresses perfect equality, where all would have the same income,a Gini coefficient of 1 expresses maximal inequality among values. In 2016, the Gini coefficient for family income was 0.45. This is an increase since 1990, when the Gini coefficient was at of 0.4 points, indicating an increase of income inequality in the U.S.