The provided pie charts illustrate the changes in the percentage of five different genres of books sold by a bookseller over a 40-year period from 1972 to 2012.
Overall, the data indicates a significant increase in the sales of adult fiction and children’s fiction books, while there was a marked decrease in the sales of biographies and other genres. The proportion of travel books experienced fluctuations during this period.
Specifically, the percentage of adult fiction books saw a substantial surge from 20% in 1972 to 45% in 2012, representing a twofold increase over the 40-year period. Similarly, the sales of children’s fiction books showed a consistent upward trend, rising from 20% in 1972 to 25% in 2012.
In contrast, the sales of biographies declined from 15% in 1972 to 10% in 2012, while the proportion of other genres of books also decreased from 20% to 12% during the same period. The sales of travel books fluctuated between 8% and 18% over the 40-year span.