The following is an example of?

The following is an example of Current Year Prior Year Segment Amount Percent Amount Percent College textbooks $ 78,000 25.0% $ 55,000 18.9% High school textbooks 129,000 41.3 115,000 39.5 Elementary school textbooks 105,000 33.7 121,000 41.6 Total revenues $312,000 100.0% $291,000 100.0%