Increasing coursework

 I just realized that the coursework in my college increases at a very fast pace as the years go by.
Here's the proof:
my directory sizes of the data in each year's courseware. 4th years data is as yet incomplete as mid-terms are just over and half a sem is still remaining. (y* are the year's coursework directories)

[pankaj@localhost courseware]$ du -sh y*
158M    y1
322M    y2
1.7G    y3
2.2G    y4

UPDATE: The score is 6.9 GB for y4 at the end of the year, most of it is a single course, with hundreds of MB of datasets and simulation videos