–Which urban areas was the largest in 1950?

New York-Newark

–Which is expected to be the largest in 2030?

Tokyo, Japan

–Which had greatest rate of change between 1950-2015?

Nay Pyi Taw, significantly 

–Are any urban areas expected to lose population from 2010 to 2030?

Yes

–If so, how many and which one is expected to lose the most?

45 countries, Riga Latvia is expected to decrease by 24%

–Which United States urban area is expected to have the largest percent increase from 2015 to 2030?

The Woodlands, by 66%