The given bar charts illustrate different types of books sold by a bookseller in three distinctive years: 1972, 1992, and 2012.
Overall, the proportion of adults’ fiction and children’s fiction books sold followed upward trends, while biography, travel and others sectors experienced declines throughout the period.
As can be seen from the charts, the popularity of adults’ fiction and children’s fiction books accounted for a fifth of the total for each sector. In the next 20 years, both of them increased to 25% and 22% and finally reached peaks of 45% and 25% respectively in 2012, with adults’ fiction books became the bestseller. However, the remaining counterparts underwent reverse trends. Even though the percentage of travel books sold rise to 18% in 1992, it dropped by 8% at the end of the period. There was a constant fall in the biography sales, from 20% to 8% over the 40-year period, becoming the least popular type of book in the final year. Other books sector constituted the highest percentage at 25% in the first year, but then shrinked to just 12% in 2012.