Is that the right link? There are no other engineering fields on that graph.

Are physical sciences a category of Engineering? If so then your graph proves your point, if not then I don't see it. What am I missing?

This is what Google told me it was. http://study.com/directory/category/Physical_Sciences.html

I think you meant this one - http://i.imgur.com/nzEulzf.png

It shows the growth trend as typically being positive for all fields, while computer science is the negative outlier.