The bar graph above shows the total number of book sales for five genres of books for three years, from 2013 through 2015.
Across the three years, total sales of romance novels ranked highest, with more than 1500 copies sold. Second highest were books in the fantasy genre at approximately 1400 sold, followed closely by science fiction and then thrillers. Mystery books had the lowest sales numbers, at roughly 1000 across the three years. Only about two-thirds as many books were sold in the mystery genre as in romance.
Broken down by year, the graph indicates that 2014 was the slowest year for sales of romance and fantasy books. Romance was the most-sold genre in both 2013 and 2015. Sales of books in the mystery, thriller, and science fiction genres were slowest in 2015. Overall, combined book sales in all genres were highest in 2013, possibly indicating a decline in fiction reading during the three years shown.