The chart illustrates the changes in sales of four types of books including hobbies, entertainment, history and arts from 2002 to 2012.
Overall, it is evident that history sold the most booksin all years, while hobbies books showed the lowest figure at the same time.
In 2002, the sale of history and hobbies books were about 5 and 1 thousand copies, and both had a slight increase in the following years. However, history experienced a significant increase in 2006 to a sale of 8 thousand copies, hobbies, decreased to one-tenth thousand. Hobbies books stayed at the same level for the rest years. History, showed a fluctuated diagram with a pick to 10 thousand copies in 2008, and then a slight decrease to about 8 thousand copies again. And then it started to increase again.
Entertainment and art books showed same figures in most years. in 2002 and 2004, the sale of entertainment and arts books were 1/8 and 1/9 thousand copies respectively. They both experienced an increase to 3 thousand copies in 2006 to 2008 similarly. Entertainment books remained the same for the followingyears while, art increased sales to 4 thousand copies to the end of the period.