Thanks, fixed the link.
When you consider that the top 5 on that list take up 50% of the population. Auckland continues to grow, and at 30% of the population already, it has an crazy effect on the economic decisions in the country.
It is also growing geographically, eventually Auckland and Hamilton will merge somewhere around Huntly (#50).
Auckland is the definition of sprawl.
A bunch of laws were past on the last few years to combat it, but we find see the effects for decades to come.