The pie charts depict how many books were sold by a bookseller between 1972 and 2012. Books were divided into different types. Overall, it is apparent that adult fiction (stories and novels) became by far the most popular type at the expense of the genres which declined in popularity (other types of books, biography, and travel). Interest in children's fiction also increased. Since 1972, bookstores sold the same amount of adult fiction, children's fiction, and biographical books. In addition another led by 25%. This was about 10% more than travel books, which stood at 15%. Twenty years later, adult fiction, children's fiction, and travel increased by 5%, 2% and 3%, respectively, but biographies decreased by 5%. Furthermore, with the final year, adult fiction grew a lot to 45%, and children's fiction increased a little to 25%. Biographical books and travel books fell by about 8%, while others ended at 12%.