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Thanks for the data! It seems that adjusted for inflation, it still is an overall net decrease (11,500$ in 1990 equals about 27,000$ today).

No, look at the chart again, it's denominated in constant 2021 dollars, i.e., adjusted for inflation. Public school spending has increased.

The data is already adjusted for inflation as indicated in the y-axis label, "Expenditure in constant 2020-21 U.S. dollars".