using "percent of taxes" is an arbitrary metric. Why not ask about percent of wealth? I assume because "taxfoundation.org" is in the business of lowering taxes, which is only one of many things to be optimized in the US government.

https://en.wikipedia.org/wiki/File:US_Wealth_Inequality_-_v2...

Eyeballing this chart suggests that the top 10% have more than 69% of the wealth, so paying 69% of the taxes seems like a good deal for them.