
the
BIG 5 --> according to CTBUH, emporis and wikipedia:
--- counting towers which are completed and topped out, respectively ---
buildings over 500ft: NY 205, HK 242, shanghai 104, dubai 125, chicago 105
buildings over 600ft: NY 91, HK 86, shanghai 62, dubai 74, chicago 44
buildings over 656ft: NY 53, HK 54, shanghai 43, dubai 56, chicago 27
buildings over 984ft: NY 4, HK 6, shanghai 3, dubai 14, chicago 6
buildings over 656ft under construction: NY 5 (on hold: 3), HK 0, shanghai 5, dubai 23, chicago 0 (on hold: 2)
about dubai there's no reliable information... so the numbers could be wrong. same goes with shanghai in the 500ft+ category: should be at least 150 towers.
sorry for going off topic.