funding - American universities - where does all the money go?

This question is about Title-IV eligable 4 year institutions in America, the majority of which are non-profit.

Colleges have a range of funding sources, including tution fees. Tuition fees have increased by ~500% in the past 5 decades, much faster than inflation.

My question is, given the increase in income from that source, and that the institutions do not make a profit, where is the money going?

For instance, is this offset by decreases in state funding? Are they spending a lot more on grounds maintainance or research?

I would prefer answers that refer to some kind of data, for instance graphs, university financial report...