 Under the Democratic administrations in this time period, (Truman, Kennedy, Johnson, Carter, and Clinton) the pre-tax real income growth rate for the bottom 20% was 2.64% while the pre-tax real income growth rate for the top 20% was 2.12%.During the Republican administrations of this time period (Eisenhower, Nixon, Ford, Reagan, G. H. W. Bush, and G. W. Bush), the pre-tax real income growth rate was 0.43% for the bottom 20% and 1.90% for the top 20%.The disparity under Democratic presidents in this time period between the top and bottom 20% pre-tax real income growth rate was -0.52% while the disparity under Republican presidents was 1.47%.