The charts provide key information about, the popularity of five different types of books during the period between1972 to 2012 , And the unites are measured in percentage.
Overall, It is clear from the charts that adult fiction popularity increased during the period between1972 to 2012 , whereas the others category decreased at the same time wich lead us to the direction of wanted and unwanted kindes of books during these generations.
According to what is shown, Adult fiction in twenty years increased by five percent (1972-1992) then strongly increased by 2012 to form the majority of popular books, on the other hand the others category decreased gradually from 25% to 20% afterwards in 2012 the others category shaped12% of the chart, And it is obvious that during (1992-2012) books interests changed.
In terms of children fiction it was approximately constant between (1972-2012) Because it increased by just 5% , The last section is biography, Biography sector during the forty years was the least common section among them.
