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2. The charts indicate the proportion of five types of books sold by seller in 4-decade from 1972. Overall, adult fiction was the book bestseller during the timeframe given. Meanwhile, travel books were recorded a small changes of trend. As can be seen from the charts, adult fiction saw a significant growth. This book accounted for 20% in total books are sold in 1972 and slightly increased to 25% in 20-year laters before reached the first place at nearly a half in 2012. Mirror this trend was children’s fiction, it stood at a lower rate than adult ones with 20% (1972) then upper to 25% in the final time. Regarding the remaining categories, the percentage of biography book saw a noticeable decrease, starting at 20% and declining at 15%. In 2012, this book was the least popular at only 8% by customers’ rating. Meanwhile, there was a fluctuation trend in travel book, beginning at 15% and then increasing slightly at 18% before declining again at 10% in 2012. The final category was others books, it was observed a gradual decline from 25% in 1972 to 20% and 12% after 40 years.