The given pie charts illustrate the proportion of 5 different book types in sales from a bookseller from 1972 to 2012.
Overall, according to the whole periods, the largest sales had been seen in the kind of the adult fiction, with the lowest one was biography in the same time. Meanwhile, there was a fluctuation in all categories, and the most dramatic shift was seen in the figure for the adult fiction.
Concerning the charts in 1972 and 1992, five sorts of books similarly distributed within a range of 15% to 25% with the major part from the category of others, while the travel was only a case under 20%, with just 15%. However, after 20 years, the adult and children’s fiction books surpassed to stay at the forefront, occupied 25% for the former and 22% for the latter. Besides, both the travel and biographic became less attractive with the customers, accounted for 18% and 15%, respectively.
Moving on to the last figure, the adult fiction was constant to be a majority with a significant jump by 20% and outnumbering with others, as compared to the second, which was the children’s fiction, accounting for 25%. Additionally, the others remained the downtrend to 12%, whereas the travel and biographic continuously took up under around 10% and the same order in 2012.