The number of new cases being identified has declined substantially.

The proportion of poor people has declined substantially in recent years.

The company must still struggle with the fact that its sales have declined substantially in the last year.

By the 19th century, the spice trade had declined substantially.

Given all that, its cash will "decline substantially" during the rest of the year.

Individual membership reached a high of 60,000 in 1991, but declined substantially since then.

The violence declined substantially, with effective victory for the government.

By the time trading was over yesterday, the value of the deal had declined substantially.

Officials conceded that the costs of the war would probably not decline substantially any time soon.

Since the implementation of this policy, the dollar has declined substantially.