The provided pie chart delineates the percentage of five kinds of books sold by a bookseller over a 40-year period spanning from 1972 to 2012.
Overall, it is immediately apparent that the adult fiction book experienced an upward trajectory, whereas the biography book witnessed a downward trend over the timeframe. Furthermore, the others kind of books in 1972 consistently registered the most significant figures, in stark contrast to, the biography kind of books in 2012, which accounted for the smallest percentage of the different kinds of books.
In terms of the books in 1972, initial figures stood at 20% in 1972, before climbing exponentially to culminate in a peak of 45% by 2012. Simultaneously, a parallel trend was observed in the books in 1992, the percentage of the adult fiction book which slightly increased by 20%, thereby overtaking the books in 2012 as the primary change in 2012. This upward momentum sustained until the conclusion of the period, when figures ultimately reached a zenith of 45%.
Conversely, the trajectory for the others kind of books in 1972 followed a diametrically opposed pattern. Having started at a relative high percentage of 25% in 1972, it plummeted sharply to hit a nadir of 12% by 2012. Meanwhile, the percentage of the children’s fiction kind of books between 1972 and 2012 remained virtually unchanged throughout the duration, hovering roughly around 20%, 25%. The timeframe concluded with the biography kind of books in 1972 and 2012 stabilizing at 8%, meaning it is the least significant category overall.
