Sales trends for three book categories from 2002 to 2006

The line graph illustrates the sales performance of children's books, adult fiction, and educational books in a specific country between 2002 and 2006, with figures measured in million dollars.

Overall, children's books saw a consistent rise in popularity, eventually overtaking other categories. Conversely, adult fiction experienced a downward trend over the five-year period, while educational books fluctuated but generally remained the lowest-selling category.

In 2002, adult fiction was the most popular, with sales at 45 million dollars, followed by children's books at 33 million and educational books at 25 million. By 2003, children's books surged to 42 million, surpassing adult fiction, which fell to 37 million. Throughout the remainder of the period, children's books maintained a steady growth, reaching a peak of 56 million dollars in 2006.

In contrast, adult fiction sales were volatile, dipping to 33 million in 2005 before ending the period at 30 million dollars. Educational books showed a similar pattern of instability; after rising to 32 million in 2003, they dropped to 25 million in 2005, before recovering slightly to 33 million in 2006, finally matching the initial 2002 sales figure of children's books.