Skyline size from year to year or decade to decade

The thread Good Times.....by TUP got me thinking..... I wonder does anyone out there have Chicago's skyline size say starting at the turn of the 19th-20 th centruy.....then running maybe at 5 year intervals until present.... It would be interesting to see which periods were ones of quick growth and which periods stalled.... Also it would be interesting to see how the current boom compares historically.... also numbers for NY as compared to CHi would be interesting to see how the two cities developed in comparison to each other.....and to witrness boom / stall periods in boths history thoughts>