University of Maryland
Sociology 441: Stratification 
graph top quintile income, 1950-2005

Other family income trends:
Median income
Bottom quintile

Quintile ratios:
Ratio of top to bottom
Ratio of top to median
Ratio of median to bottom

Income share trends:
Share of bottom quintile
Share of middle quintile
Share of top quintile
Gini index of inequality


Sources: US Census Bureau,

return to: Sociology 441 home page Sociology 441 list of figures

Last updated November 7, 2002
comments to: Reeve Vanneman.