The pie graph illustrates the percentage for various types of books in three years 1972, 1992 and 2012 sold by a bookseller. In general, the highest changes for the proportion was in 2012.
In 1972 and 1992 the percentages for all types were almost the same. Most kind of books was the fifth percent. However, there was some types which slightly increased such as Adult fiction, it was 20% in 1972 and rose to 25% in 1992. Also Children’s fiction got a small grow by 2% only. However, the other kinds of books got a visible decrease. For example: The biography books was 20% in 1972 and droped to 15 in 1992.
In 2012, all percentage got a sharp changes. The most clear change was for Adult fiction book. It had an acute grow up and reached 45%. The Children’s fiction slightly expand by 3%. In the other hand, the rest kind of book declined significantly.