Studies have shown that the average ice thickness has decreased in recent years.

Crime increased at this time, but has decreased greatly in recent years.

The population of sharks has sharply decreased in recent years.

Use of these names have decreased in recent years.

Another issue is the overperscription of drugs, though this has decreased in recent years.

He said that available prison space had decreased in recent years.

Its size has decreased much in recent years and some illegal constructions have been made.

Massachusetts has seen both population increases and decreases in recent years.

It is very rare and its numbers have been decreasing in recent years.

We should also not forget that the birth rate has decreased in recent years.