The pie charts show how much time per week is spent by three groups of subjects in a British university library.
Overall, postgraduates use the library the most whilst the lowest amount of time is spent by undergraduates. Moreover, the second-ranking belongs to all students.
Half of all students consume 1-7 hours every week in the library. The other half of this group spend at least 8 hours, with a mere 15% spend 15+ hours. Turning to undergraduates, the pattern is similar. Over three-fifths of this group use the library between 1 and 7 hours weekly, which is double the rate of those who spend 8-14 hours. Meanwhile, a tiny minority (9%) of undergraduates spend 15 or more hours.
By contrast, a reversed pattern can be observed for postgraduates. Nearly half of this group spend from 1 to 14 hours each week in the library, which means the proportion of those who consume 15+ hours accounted for 51%. In specific, a total of 17% of postgraduates use the library for 1-7 hours and 32% use it for 8-14 hours per week. 
The pie charts  
show
 how much time per  
week
  is spent
 by three  
groups
 of subjects in a British university library. 
Overall
, postgraduates  
use
 the library the most whilst the lowest amount of time  
is spent
 by undergraduates.  
Moreover
, the second-ranking belongs to all students.
Half of all students consume 1-7  
hours
 every  
week
 in the library. The other half of this  
group
  spend
 at least 8  
hours
, with a mere 15%  
spend
 15+  
hours
. Turning to undergraduates, the pattern is similar. Over three-fifths of this  
group
  use
 the library between 1 and 7  
hours
 weekly, which is double the rate of those who  
spend
 8-14  
hours
. Meanwhile, a tiny minority (9%) of undergraduates  
spend
 15 or more hours.
By contrast, a reversed pattern can  
be observed
 for postgraduates.  
Nearly
 half of this  
group
  spend
 from 1 to 14  
hours
 each  
week
 in the library, which means the proportion of those who consume 15+  
hours
 accounted for 51%. In specific, a total of 17% of postgraduates  
use
 the library for 1-7  
hours
 and 32%  
use
 it for 8-14  
hours
 per  
week
.