Currently, the average number of students who attend online courses is 5.5 million per month.
The most popular platforms are Udemy, Coursera and Lynda. These platforms have more than 90% market share for online courses which has been growing at a rate of 20% every year.
However, we should not forget that the demand for these courses is still low as compared to other areas like on-campus learning. So it will take some time before these numbers can match up with what they are today in terms of popularity and growth.
I hope this answer helps!