The population is increasing rapidly.

I was surprised at his quick progress.

I am surprised at the quickness of this project's progress.

The population of Japan is decreasing.

There is a beautiful park in my town.

Mr. Machi is my best friend.

I work in Shibuya Machi, Tokyo.

The population of this town is rapidly increasing.

The next census will be conducted next year.

Demography is a part of social science that studies the structure, evolution, and problems of human population.