What are the numbers, adjusted for inflation and taking into account a rising population of students, in terms of spending on education? Where did that money go

What are the numbers, adjusted for inflation and taking into account a rising population of students, in terms of spending on education? Where did that money go exactly, was it spent on teacher salaries or was it spent on administrative overhead and "services" unrelated to the business of actually teaching? How evenly is that spread? Those all seem like important questions to ask and answer before we talk about an alleged "massive increase in spending" around education.