Well, they've been building buttloads of stuff, and the rest goes into the "food" they export to us! ;)
There should be a comparison with steel as well because now buildings are built around a central concrete tower that the outer steel is attached to. and then not so much steel mosnly concrete. The cement form is slid up and filled then slid up again. My building the two comcast buildings and then a new one next door where all done this way. so for the last 20 years this looks more like the norm in construction.