The pie charts depict the sales proportion of different types of books in a 40 year period from 1942.Overall, there was a noticeable shift in proportion of books sold in 20 last year,especially adult fiction which became by far the most popular type of the genres. While the statistics during 20 start years witnessed a general similarity.
As can be seen in the graph between 1972 and 1992, the percentage of adult fiction and others showed a reverse pattern. In detail, the adult fiction ratio increase from 20% to 25% while other groups decrease from 25% to 20%.The remaining 3 groups of data illustrated stability period, these statistics fluctuate below 20%, expect Children’s fiction counterpart in 1992 had a slight escalate to 22%
Moving onto the second half of this pie charts, it is apparent that adult fiction soared over 20 last years.In contrast, biography, travel, and others both slump about 7-8% with 8%, 10% and 12%, respectively . Meanwhile, the children’s fiction continued swell trends by 2012, which climax at 45%