The pie charts demonstrate the proportion of selling five various types of books that a bookseller sold between 1972 and 2012.
Overall, there is an obvious increase in the proportion of adult fiction and a slight rise in children books, whereas biography, travel and books about other topics decreased over the given years.
In 2012, sale of adult fiction performed a significant increase in its proportion, reaching from 20% in 1972, 25% in 1992 to just below half of the top booksellers (45%). Furthermore, there is a stability in the rise of percentage of selling the books for the children, rising from 20% in 1972 to 25% in 2012.
In comparison, the category of biography books witnessed a sharp decrease over the years, falling from 20% in 1972 to15% in 1992 and ranked 8% in 2012. Additionally, the selling of the books about the other subjects occured the quarter of the category in 1972 which fall to 12% in 2012. On the other hand, the percentage of travel books increased by 18% in 1992 and dropped to 10% in 2012.
