The given bar chart illustrates the distribution of 
books
 sold across four different Use synonyms
book
 categories in terms of thousand unit Use synonyms
copies
 Use synonyms
sales
 between 2002 and 2012. 
Use synonyms
Overall
, the proportion of history Linking Words
books
 was the most significant Use synonyms
book
 Use synonyms
sales
 Use synonyms
while
 the proportion of hobbies Linking Words
books
 was at least. Use synonyms
However
, entertainment Linking Words
books
 and art Use synonyms
books
 were Use synonyms
similarly
 grown up in every year. 
Linking Words
According to
 the graph, history Linking Words
books
 were the leader in Use synonyms
book
 Use synonyms
sales
 every two-different years. It dramatically rose from 4 to 10 unit Use synonyms
sales
 from 2002 to 2008, respectively, Even though, the ratio of unit Use synonyms
sales
 dropped but it still rose in the years 2012. Use synonyms
In addition
, the number of art Linking Words
book
 Use synonyms
sales
 gradually increased every year from 2 Use synonyms
copies
 Use synonyms
sales
 to 4 Use synonyms
copies
 Use synonyms
sales
.
Use synonyms
On the other hand
, the number of hobbies Linking Words
books
 Use synonyms
sales
 slightly increased from almost 1 thousand Use synonyms
copies
 Use synonyms
sales
 to approximately 2 from 2002 to 2006. Before, it was equally represented the same ratio to the year 2012. Entertainment Use synonyms
books
 relatively increased from 2002 to 2012 more than 1 thousand Use synonyms
copies
 Use synonyms
sales
.Use synonyms