The charts illustrate how peoples satisfaction about a local library changed in two different aspects for distinct three age groups.
The graph demonstrates that The number of people satisfied with range of books and non-printed material is different with age. About range of books, 55% of people under 15 years old think it is very good which is the largest numbers in the most satisfaction range. In the age group from 14 to 39 years old, nearly 22% of people think the book is not good, which has the least percentage. However, the age groups from 14 to 39 and above 40years old have the same attitude in satisfactory.
About non-printed material, half of the people under 15 years old think it is not a good while 55% of the people think it is very good and people who are 14 to 39 years old also agree.
Overall, people in different ages may have different demand, which lead to different satisfaction about two aspects in the local library.
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