The graphs don't show that: there's no data points at all between 2012 and 2020. The extrapolation doesn't imply a linear decline. It's also worth noting that

The graphs don't show that: there's no data points at all between 2012 and 2020. The extrapolation doesn't imply a linear decline. It's also worth noting that educational spending hasn't actually increased that much in real terms over the last decade[1]. [1]: https://nces.ed.gov/fastfacts/display.asp?id=66 https://nces.ed.gov/fastfacts/display.asp?id=66