The pie charts illustrate the distribution of five types of books sold in a bookstore over three years: 1972, 1992, and 2012.

In 1972, the largest category was "Others," accounting for 25% of sales, followed equally by "Adult fiction" and "Biography" at 20% each, with "Children fiction" at 20% and "Travel" at 15%.

By 1992, the preference shifted slightly, with “Adult fiction” increasing to 25%, while "Biography" dropped to 15%. “Children fiction” remained steady at 20%, and "Travel" increased to 18%. The "Others" category stayed at 22%.

In 2012, there was a significant change. "Adult fiction" surged to 45%, becoming the dominant genre, while "Biography" decreased further to 8%. "Travel" also saw a decrease to 10%. "Children fiction" remained unchanged at 25%, and the "Others" category dropped to 12%.

Overall, there was a clear trend showing a growing popularity of "Adult fiction" over the years, while "Biography" and "Travel" suffered declines. "Children fiction" holds steady, indicating consistent interest. The "Others" category shows a decreasing trend, suggesting a more focused range of book choices over time.