The pie charts provide information on the proportion of different books that were sold by a particular bookseller from 1972 to 2012.
Overall, the sales of adult fiction and children’s fiction grew over the given time period, while travel and biography continued to be the least favourite among individuals.
In 1972, only 20% of adult fiction book was sold; however, these books gained huge popularity over the given years and constituted a major portion of 45% of total book sales in 2012. Moreover, children’s fiction waivered around 22% over a given 40-year period.
Moving on to the other categories, although other books had a significant share of nearly a quarter in 1972, but the sales of these books witnessed a fall in the following years and accounted for only 12% towards the end. Similarly, biography could be seen losing its share starting from 20% in 1972 and declining to 8% in 2012. Finally, travel accounted for 15% in 1972 and rose to 18% in 1992 before declining to 10% in 2012.