Just read a tech news article that stated a study of 20,000 web sites traffic revealed that 61% of the web traffic was generated by BOTs (automated web crawlers).
The study then concluded that 38.5% of web traffic was human traffic.
However, (my thoughts), this doesn't take into account the amount of spam email, and advertising, which I would estimate are 50% of everything I see (or have forced onto me).
If so, then less than 20% of internet traffic is wanted user traffic. Further, 80% of my internet charges go to supporting traffic that I'm not getting any use out of.