The pie graphs illustrate how many five types of books were sold by a bookseller in the years 1972, 1992, and 2012.
Overall, other unspecified types of books were sold the most in 1972, while people bought adult fiction the most in 1992 and 2012. It is also clear that while travel-related books were sold the least in 1972, the same was true for biography books in the other years.
Looking first at the most popular types of books, the percentage of other kinds of books being sold in 1972 was the highest, with a figure of 25%, followed by a steady decline to the second and third position in 1992 and 2012 respectively. The proportion of travel books sold in 1972 was 15%, after which it rose slightly in the next 20 years before falling considerably to 10% in 2012.
As for the other kinds of books, it is important to note that the percentages of adult fiction, children’s fiction, and biography books in 1972 were equal to that of other types of books in 1992, after which they witnessed different trends. While the share of biography books decreased steadily to remain the least popular type of books in 1992 and 2012 (with only 15% and 8% of this type of books being sold respectively), the reverse was true for adult fiction books, as this kind of books increased significantly from 22% in 1992 to 45% in the next 20 years to become the second and most popular type of books in the respective years. 22% of children’s fiction books were sold in 1992, followed by an increase to 25% during the next 20-year period.
