The given diagrams illustrate the proportion of different kinds of books sold by a bookseller between 1972 and 2012.
Overall, it is clearly seen that the proportion of adult fiction books was dominant in 1992 and 2012, while others were in 1972. Moreover, biography was the least popular genre in 2012.
Turning to the details, in 1972, the proportion of adult fiction books stood at 20%, followed by a modest rise to 25% in 1992. Furthermore, this ratio dramatically increased to 45% in 2012, thus making it most preferable genre among readers. In addition, the ratio of children fiction books accounted for 20% in 1972, before slightly increasing to 22% in 1992 and 25% in 2012 respectively.
Regarding the other genres, the proportion of both other and biography books declined, with former standing at 20% and latter at 15% in 1992. Moreover, the percentage of other books decreased to 12% in 2012, followed by a biography section at 8% in 2012. The ratio of travel section, which stood at 15% in 1972, saw a modest increase to 18% in 1992, before noticeably dropping to 10% in the last period.
