What distinction do you draw between academics and teachers? Those are usually overlapping roles.
According to https://publicaffairs.vpcomm.umich.edu/key-issues/compensati... (just an example of a public university), it's $376K to executives, $481K to deans, and $152.7K to faculty in FY2013. Deans usually count as ~50% admin, so we could call that $376K + $240.5K = $616.5K to admin and $240.5K + $152.7K = $393.2K to faculty, roughly a 3:2 ratio.
"Academic" is kind of a broad brush. A professor and a teacher are both academics. One difference is tenure and research. A professor is eligible for tenure, and expected to do research or scholarship. They can train grad students.
In contrast, most undergraduate teaching is done by "adjuncts" for whom the job is essentially gig work. Moreover, professors are considered "faculty" and adjuncts "staff," making it confusing to figure out how many employees of a university are engaged in teaching versus doing other things. For instance a faculty-to-staff ratio would be misleading.
Disclosure: I was an "adjunct" many years ago.
I'm an academic and its difficult for me to imagine what the fuck deans do that is worth ~3-4 times as much as the people actually teaching and doing research. Fire them into outer space, I say.