The pi charts illustrate the percentage number of adults and children fiction, biography , travel and other books sold by a bookseller from the year 1972 to 2012
respectively.
Looking from an overall perspective, it is evident that the number of purchases made from adults and children fiction increased significantly while other book and biography decreased with time. Although, travel grew up in 1992 but decreased at the end of the given period. Notably, adult fiction made greater sales at the end of 2012, meanwhile biography had least purchase.
Focusing on the sales of Adult and children fiction, although adult fiction began at just 20% in 1972, the percentage went up by 5% respectively in 1992 and peaked at exactly 45% substantially. Conversely, children also began at 20% and stood at exactly 25% at the end of the given period. Meanwhile, the sales of biography and travel experienced a fall from 20% and 15% to roughly 10% and 8%. In contrast, there was slumping in the sales of other book in the year 1972 from 25% to 12 percent.