Call it yearly nickel-and-diming, ASU has been raising their tuition rates yearly for almost more than the past decade. The increases are constantly decried by the student pool; but there's little anyone can do about it (and the economy has been blamed each time) it's not a research school for many of the subjects, although the colleges do provide some backing for much that happens.
I suspect that there might be a drop or a leveling off if the federal student loan program began to falter, but I am guessing that's where most of the cash that supports the tuition increases comes from.
I haven't been paying attention much in the past few years, but I have a strong suspicion it's the same as it's always been.
