I've learned in management that you get what you measure, so let's be very careful here.

Let me suggest two indicators that would tell volumes. Hint: neither of them are 'growth' per se. Growth for growth's sake is what cancer cells do (not that growth is bad, it's just not the goal).

Indicator 1: Average Household Income (as a measure of prosperity)

Indicator 2: The standard deviation in Household Income (as a measure of the gap between the richest and the poorest, and the health of the middle class).

If we can make the first one go up and the second one go down, I think we would have a very successful City.

And I wouldn't mind if you reported these indicators for the whole region as well, since the region is really the only meaningful economic unit.