11.   Their numbers also fluctuate in response to habitat conditions.

12.   Why do poll numbers fluctuate so much?

13.   She stressed that the numbers were fluctuating because of the changing situation.

14.   The number of sniffers fluctuated from day to day, depending on the weather, he told CBC Radio.

15.   Though their number often fluctuates, it is believed to have gradually increased over the past few years, due in part to a prolonged recession.

16.   Thousands of Israeli soldiers are usually deployed in the West Bank and their numbers fluctuate depending on security needs.