<p>
I should have thought of this before, but such a chart is actually in existence! </p>
<p>[Civil</a> Engineers](<a href=“http://www.bls.gov/oes/current/oes172051.htm#ind]Civil”>http://www.bls.gov/oes/current/oes172051.htm#ind)</p>
<p>Eh, I take that back. The chart seems pretty incomplete.</p>