The pie charts illustrate the kinds of books sold by one seller in 1972 and 2012.
Overall, it is clear that the books of children’s fiction and adult fiction which were sold by one bookseller were more common than other books, while biography was the least sold book.
Turning to details, though the books of adult fiction, children’s fiction and biography which sold by one bookseller in 1972 stood at the same 20%, then rose slightly to 22% and 25% apart from biography which fell markedly by 5% in 1992. After that, those three types of books experienced a dramatic growth at 25% and 45% respectively, particularly apart from the biography which decreased significantly from 15% to 8% in 2012.
As for the travel and other books which sold by one bookseller, in 1972, both books accounted for 15% and 25% respectively, while travel books climbed slightly by 3% in 1992 before dropping dramatically to 10% in 2012, as well as types of other books which sold by one seller dropped slowly to 20% in 1992, after again falling substantially to 12% in 2012.