The changes in the distribution of megacities between 2014 and 2030

Here you go!

Explanation:

One change is that over 50% of people live in the megacities wish produces 80% of the world's economic output.

Another change could be that in 2014 there were only 28 megacities and by 2030 there will be an estimate of 43 megacities!

Hope this helped!

answer called a epicycle;