The bar graph demonstrates the annual total sales for books with respect to their class for a three-year time lapse, between 2013 and 2015.
Overall, the bar chart illustrates the total number of books sold between the three-year time period with regard to their respective genre. Fantasy and romance books accounted for the highest revenue in total (around 1500s), and romance, mystery, thriller, and science fiction books made their highest market value according to the number of sales in the year 2013.
From the bar graph, we can observe that the fantasy and romance books remained highest for the overall sum value obtained for three years. The years 2014 and 2015 represented higher figures for fantasy books (above 1300 range). On the other side, yearly amounts accounted for romance books remained nearly equal for the years 2013 and 2015 (with 2013 a little bit higher, closely ~100). Additionally, the year 2014 remained lowest for two book types.
On the other hand, the remaining four groups of books preserve different market behaviours. The most eye-catching trend is the dominant selling number represented by the year 2013. Following, the year 2014 depicts the same kind of figure on the graph. However, the total trade accounted for a close figure in science fiction when comparing 2013 and 2014.