11.   Other problems surface when retention rates plummet.

12.   Rates plummeted as hoteliers like Marriott saw half their rooms sit empty.

13.   The figure would be reduced by an unknown factor if smoking rates plummet in the next quarter century and related illnesses decrease as well.

14.   The inflation rate plummeted.

15.   The murder of Levin, son of Time Warner chairman Gerald M. Levin, shocked a city whose crime rate has been plummeting.

16.   The national savings rate has plummeted.

17.   The murder rate plummeted.

18.   Therefore, rates have plummeted, said Independent.

19.   When parents know their children will survive, fertility rates plummet.

20.   While welfare rates plummeted in Boston, the poverty rate remained the same, a signal that many continued toiling in minimum-wage jobs.