The given pie charts illustrates type of books purchased by a booksellers, in three different years, in 1972, 1992, and 2012. The unit are measured the proportion of percentage.
Overall, the adult and children fictions increased significantly, whilst Biography, Travel, and Others fell. Moreover, through the given period, Adult and Children Fictions took more than half portions.
In 1972, Adult’s fictions, Children’s fiction and Biography started at 20%. Travel and others stood at 15% and 25%, respectively. In the following two decades, in 1992, Adult and Children Fiction increased to 25% and 22%, respectively. Whilst Biography and Others fell by 5%, Travel rose to 18%.
In the next twenties years, In 2012, Biography, travel, and other decreased, ranged around from 8% to12%. The only increased in this years is Fiction including Adult and Children. Adult fiction increased significantly by 20%, while children fiction increased slightly to 25%. When combined adult and children fictions, it counted at 70%.