The pie charts illustrate the proportion of sales for four different categories of books by a bookseller in two separate years, 1980 and 2015.
Overall, there was a noticeable shift in the types of books sold, with fiction experiencing a decline while children's books and educational books saw increased popularity. Non-fiction maintained a relatively stable share of the market.
In 1980, fiction accounted for the largest share of sales at 40%. However, this figure decreased significantly to 25% by 2015. Non-fiction books, on the other hand, made up 30% of sales in 1980 and slightly dropped to 25% in 2015, showing a relatively minor change over the period.
Children's books and educational books both started at 15% of total sales in 1980. By 2015, the percentage of children's books sold doubled to 30%, becoming the most popular category. Similarly, educational books also experienced growth, rising to 20% of sales.