The pie chart below show the percentage of five kinds of books sold by a bookseller between 1972 and 2012

The stipulated pie chart evince the information pertaining about five different types of books which were sold by shopkeeper from 1972 till 2012.
Overall, it can be inferred that, adult fiction books were maximum purchased by individuals. However, sale of travel and biography book was least in the given time period.
At the fleeting glance, in 1972, around 20% of adult fiction books were sold whereas after two decades, it was escalated to 5%. However, in 2012, it was increased with more of 20%. Moreover, sales of children fiction books were only 20% in 1972 and became 25% after forty years. The sales of biography books were rely between 8% to 20% in all eras.
Moving further, travel books was sold approximately similar from 1972 to 1992 which was accounted as 15%. While, in 2012, it was declined by 5%. Around 25% of other books were purchased by masses during 1972. The sales of other books were of 20% and 12% in 1992 and 2012 respectively.