The pie charts depict the proportion of five types of books, which was sold by bookseller from 1972 to 2012.
Overall, it is evident that adult fiction became the largest sector throughout the given period, while Biography declined consistently, being the smallest category. There was a noticeable rise in children’s fiction, whereas unspecified category faced a significant decrease. In contrast, travel books showed a fluctuation throughout the period.
In 1972, unspecified class was the predominant segment, comprising 25%. While, travel stood at 15%, being the least significant category. The proportions of adult fiction, biography and children’s fiction had 20% for each.
By 1992, the share of adult fiction and children’s fiction increased to 25% and 22% respectively, whereas Biography and travel category experienced a fall to 15% and 18% respectively.
In 2012, adult fiction accounted for 45%, making it the biggest segment. This was followed by children’s fiction at 25%. Conversely, unspecified category continued decreasing to 12%, while travel dropped to 10%. Furthermore, Biography stood at 8% at the end of the period