I hate to treat the opening post with respect and sort of push the discussion back on topic, but here goes.
One of those increases in admin is in what I loosely term "regulatory". FWIW, I include added HR functions in there, along with the added reporting & compliance related stuff required by every level of government. I'm a large mechanical contractor, at a private firm. We try hard to be efficient. Yet, with only an inflation-adjusted annual growth in the low single digits over the past 30 years, we've had to add about 7 compliance/regulatory positions...3 positions in our accounting/clerical/HR side of the house, as well as something like 4 full time equivalents in our project management group. We are now at 77 people (up from about half of that 30 years ago), and roughly 7 of those bodies were due to the steadily increasing reporting/safety/ compliance/regulation/HR/payroll burdens...I could go on...requirements to run a business. WSU is a public university...almost by definition they do not operate in a fully responsible financial manner. But if about 20% of my company's employee growth has been for the reasons discussed above, what would you guess it is at a not-for-profit government entity? 30-40%? Especially since I'd assume their compliance, regulatory & HR stuff has probably increased more than mine has?
I'm not arguing about efficiency at public universities. It is poor and always has been, driven more by available budget than need. But don't overlook the changes required to run any business...public or private...over the past 20-30 years. They are significant, and collectively they account for a lot of positions that simply did not exist back in the day. And in the public university sector, many if not most of those probably fall loosely under the admin umbrella.