Each population may have a different cause for their decline.

The first reason for their decline has been the huge size of today's programs.

This case for decline can be turned on its head.

The cause for the decline is not clear, but the effects are already being felt.

A main cause for the decline in population is human activity.

Some people would say Brown is responsible for the team's decline.

It is, they would tell me, the reason for the town's economic decline.

Their sometimes difficult character could be the reason for the decline of this line in the 1980s.

Money is a main reason for the decline of the network movie.

But he added that there might have been good reason for the stock market's decline.