Smaller population in Manhatten Chinatown?

Manhatten's total population has shrunk by 17% from 2000 to 2010.

Reasons given in the article are:

1. Moving back to China for opportunities
2. Moving to other Chinatowns due to cost
3. Gentrification
4. Reluctance to fill out census forms (perhaps an increase in Chinese with no papers)

My personal guess is cost of living.

Big trouble brewing for Chinatown? - Metro.us