Study the following bar graph that shows the number of students enrolled for different courses in institutes A and B during 5 years, and answer the question that follows.

The average number of students (per year) enrolled in A during 2015,2016 and 2018 is what percentage less than the number of students enrolled in B during 2015 (correct to one decimal place)?

A

26.7%

B

22.2%

C

25.8%

D

18.5%