The given graph demonstrates the amount of purchases of reading materials during the period from 2002 to 2012.
Overall, it is clear from the chart that the sales have been done in four separate categories of book genres. While the leading genre is history books, the others show different figures over a 10-year period.
As shown in the chart, the largest amount of books were sold on history category, which started off with 4500 copies in the year 2002. Later on, it experienced a steady increase and reached to approximately 5000 copies sold during 2004, where it rocketed and almost increased to 8200 copies of book purchased. In 2008, this genre of books was highly demanded, displaying an unbelievable figure, with 10000 copies consumed. Nevertheless, this group reported a decline with the amount of 8500 copies of reading materials bought in 2010, and after two years the sales on this category of books stopped at 9000 copies.
By contrast, materials of art books can be considered experiencing a gradual increase, since it started with selling only 1600 copies while ended up reaching to a purchase of 4000 copies by 2012. On the other side, with 1200 and 600 copies, entertainment and hobbies books were emphasized by a small group of people. Meanwhile, over time, in 2012 sales on hobbies books category remained almost at its starting point, with 500 copies. Finally, entertainment books reached to a larger group of individuals, after 10 years of gradual increase it subsequently demonstrated the figures of nearly 3000 copies sold.