But Michael O'Donnell says the number of serious bird strike incidents has remained at or below two hundred each year.

VOA: special.2009.04.01

But he says only one or two students usually choose it each year, and no one did in the graduating class in May.

VOA: special.2009.07.23

But in Louisiana alone, the oil and gas industry produces seventy billion dollars each year.

VOA: special.2010.06.19

But it welcomes between one hundred thousand and four hundred thousand visitors each year.

VOA: special.2010.02.15

But people still buy hundreds of thousands of copies of them each year.

VOA: special.2010.06.06