The pie chart compares the changing trend of five kinds of books sold by a bookseller from 1972 to 2012.
Overall, the proportions of adult fiction increased gradually in this period and became the most dominated figure at the end of this period. The figure for biography decreased these years and finally fell to the lowest one.
In 1972, the percentages of all categories were similar, ranging from 15% to 25%. 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 biography 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, biography and others fell significantly in 2012. Travel books fell to 10%, and other books decreased to 12%. The figure for biography became the least popular in 2012, which was only 8%.