The pie charts demonstrate the proportion of five types of books sold by a bookseller in the given periods (1972,1992,2012).
Overall, adult fiction, children’s fiction grew up between 1972 and 2012. However, the percentage of last 3 kinds of books decreased significantly.
In 1972, adult fiction and children’s fiction had the same popularity, and during years it increased stably. In 1972, 20% of adult fiction books sold by a seller, and it rose to 25% in 4 decades. Children’s fiction started with 20% as an adult fiction, but it grew by only 5% during the time.
During the period, travel sales fluctuated, it increased by 3% between 1972 and 1992. In 2012, it dropped to 10%. Others and biography sales had their peak in the beginning of period, 25% and 20% respectively. Others decreased from 20% to 12%. At the same time, biography went down about 20%. It had 8% of sales in 2012.