If you're going to use the GTA @ 7M (6.2 according to wikipedia[0]) you should perhaps use Metro NYC @ 23.5M[1]
[0]: https://en.wikipedia.org/wiki/Toronto
[1]: https://en.wikipedia.org/wiki/Demographics_of_New_York_City
[0]: https://en.wikipedia.org/wiki/Toronto
[1]: https://en.wikipedia.org/wiki/Demographics_of_New_York_City
Edit: actually I take that back the metropolitan NY area seems to encompass a much larger area than the GTA and goes across multiple states.