1.   Studies report a recent decrease in traffic accidents.

2.   Criminologists generally believe that the recent decrease in the crime rate stems from a variety of factors that are difficult to measure in isolation.

3.   Richard said the seasonally slow summer as well as recent decreases in memory chip prices will cause chipmakers to ratchet back orders of expensive equipment.

4.   The drugs do make a difference, as shown by recent decreases in AIDS deaths.

5.   The recent decrease in energy costs has been attributed to mild temperatures that have reduced air conditioner use.