The pie charts illustrate the proportion of book sold between 1972 and 2012. Overall, the share of fiction books for adults and children increased, while the opposite was true/bucked this pattern for remaining genres – others, travel, and biography.
The proportion of fiction books for adults made up 20% in 1972 and witnessed slight rise about 25% despite slight increase they reaches their peak about 45% in 2012. Similarly with children’s fiction books they start their trend as same as adult fiction about 20% in 1972, and increased modestly about 22% in 1992, and 25% in 2012.
The proportion of genre labelled as others made up 25% in 1972, after this point they experienced modest decrease about 20% in 1992 and 12% in 2012, similar with biography in the first year 20% in 1972 and the following 20 years 15% in 1992, and the end of the year the biography showed the lowest proportion of sales 8% in 2012. Share of books for travel in the initial year they made up 15% after this point sales of travel witnessed slight increase 18% in 1992, despite increasing in the following year they decreased modestly 10% in 2012