Who cares what percentage of the total internet traffic is monitored? This is a totally disingenuous metric to put forward. Most of the traffic on the internet is not meant to be private. Most of the traffic probably even isn't created by humans.

Interesting metrics to debate:

What percentage of American emails are recorded by the NSA? 0.0004% or 100%? What percentage of American phone calls are recorded by the NSA? 0.0004% or 100%? What percentage of American text messages are recorded by the NSA? 0.0004% or 100%?