[refurb]

The percentage of all taxes paid by the top 10% hasn’t really changed over the past century.

Despite have marginal rates >70%, very few people ever paid them.

[ceejayoz]

True for the top 10%. Put in the top 1% (~$500k), though, on the effective tax rate chart at https://qz.com/74271/income-tax-rates-since-1913/ and you'll see it has dropped significantly for that population (by about half) since about 1980.