The pie chart compares the changing trend of five kinds of books sold by a bookseller from1972 to 2012.
Overall, the proportions of adult diction increased gradually in this period and became the most dominated figure in the end. The figure for biology decreased these years and finally fell to the lowest one.
In 1972, all of the categories were devised evenly at about 20%, and the most popular type of books was the other, which was at 25%. The percentage of adult fiction increased slightly in the next two decades and became the highest figure in 1992(25%). The figure for children’s fiction remained steady during this period, which only increased 2%. However, the proportions of other categories decreased gradually, and the lowest one was the type of biology in 1992 (15%).
The figure for adult fiction increased dramatically in 2012, and became the highest one at 45%. Although the proportion of children’s fiction rose in these 20 years, it did not surpass 30% and was at 25% in 2012. In terms of travel, biology and others fell significantly in 2012. Travelling books fell to 10%, and the other books decreased at 12%. The figure for biology became the least popular in 2012, which was only 8%.