The number of jobs requiring expertise in science, technology, engineering, and mathematics (STEM) fields has risen by 34% over the past decade, leaving employers scrambling to recruit graduates with the required skills. But training the workforce of tomorrow isn't easy: research shows that fewer than 40% of students who begin a STEM program ultimately graduate with a degree in their chosen field, while about a fifth drop out of college altogether.
source https://www.lifetechnology.com/blogs/life-technology-science-news/why-dont-students-stick-with-stem-degrees