The bar chart below shows the number of students in three different courses from 2001 2004

Given is the graph presenting the information about the number of students taking three different courses during a period of four years, between 2001 and 2004. From the data, it can be seen that the number of students taking course A and course B substantially rise over the period of the year. However, the overall growth in numbers shows that students prefer taking course C in the end of the period.

In 2001, students taking course A pointed at above 4 millions, but suddenly decreased in 2.5 students in millions after the first year period. However, the figures showed a gradual rebound on 3.5 millions over the next year and not leveling off until the end of the year, standing at 5 millions of students taking this course.

Moving onto course B, in 2002 the proportion of participants taking this course rose to 4.5 millions. The numbers increased twice as many as students in the previous year, which had only 2.5 millions. Since henceforth, the popularity of this course fell again, a little below 2 millions, but in the end of the year the data showed the reverse.

Some type of statistical analysis reveals that the course C had the same preference from 2001 to 2002, with 20 millions of total participants. In contrast, the total students for this course slightly increased in 2003, and continued to rise to 5 million students until 2004.