[clusterhacks]

I don't have a good answer to your question here are some results from a quick google search:

https://blog.prepscholar.com/average-sat-scores-over-time

I think a sometimes-easy-to-overlook factor is that many state flagship institutions like UT-Austin have a strong bias or preference for in-state applicants. Famously, I remember being told that out-of-state applicants to my state's big, somewhat well-known, public university needed better credentials than highly selective private institutions required/recommended . . .

[mariojv]

This is a good answer.

UT Austin in particular used to automatically accept anyone whose GPA was in the top 10% of their school for in state applicants, regardless of that school's performance. It was meant to give people from different calibers of schools from across the state a fair chance, since school quality would inevitably affect test scores.

Now, it looks like the top 6%: https://admissions.utexas.edu/apply/decisions