The four groups of bars are the illustrations of the numbers of applications for four courses of a university in three separate years – 2008, 2013 and 2025.
In the two historical years, with merely 500 or 600 students studying it, History was the obvious undesired realm of study. [接下来一句“信息过渡”]Distinct from History, Business, Biology and Engineering were popular; however, their popularity varied. It is most notable that Engineering received as many as 5,000 applications [换个概念写作：“收到了6千份申请”，防止信息的生硬感] in the year of 2013. In addition, the year of 2008 is also noticeable, as it witnessed that the numbers of applicants for biology and for business were both 4,000. [主语划线部分的两种状语形式]
By 2025, the high levels of [(某事物)的某种程度的] popularity of Engineering is likely to remain, and the estimate [估值] for the number of applicants is 6,000. By marked/stark contrast, the other three spheres are projected to be far [程度副词] less desired, as they may receive fewer than 1,000 applications.
Overall, Engineering and History were the two most noteworthy courses in the past, and the year of 2025 will see the same pattern.