https://taxfoundation.org/data/all/federal/taxes-on-the-rich...
I found this footnote particularly interesting:
It is worth noting that, per the Piketty, Saez, and Zucman data, the tax rates of the top 0.1 and 0.01 percent of taxpayers have dropped substantially since the 1950s. The average tax rate on the 0.1 percent highest-income Americans was 50.6 percent in the 1950s, compared to 39.8 percent today. The average tax rate on the top 0.01 percent was 55.3 percent in the 1950s, compared to 40.8 percent today.
Note that those percentages include Federal, state, and local taxes.