The given bar chart compare data about the five kind of books that was sold by bookseller in three different years (1972 , 1992, 2012). Overall, it is important that adults and children’s friction books was more popular over three years and its trend was increasing. However, the amount of sales of other categories books decreased over the period.
According to graph, the interest of people in adults books which is sold in greater amount over year from 1972 to 2012. Furthermore, the percentage of buyer books shows incredible increased from 20% to 49% in three years.
Moreover, the children’s friction was also show significant rose in sales from 20% to 25% in given years.
The amount of sales of other kind of books ( travel, biography, other books) shows a huge decline over years (1972 , 1992 , 2012). The diagram demonstrate biography sales,the third one , at the beginning it was 20% after that in 1992 it was 15%. Nevertheless the percentage reduced and reached 8% in 2012.
In contrast last one was travel at the start it was 15% in 1992 it hit vertex at 18% and then decline up to 10% in 2012.