There is no amount of statistical analysis that you could do to extrapolate the amount of traffic with anything even approaching accuracy. I also have approaching zero confidence that any government agency or even a contractor funded by the government would be able to approach adequate methods to allow even an attempt at statistical analysis.
The "small picture" you would get, is very well probably the 80% we are talking about, e.g., 80% of all traffic that is associated with kiddie porn and is also unencrypted because the perpetrators are unsophisticated is actual kiddie porn traffic, which says nothing whatsoever about the overall amount of traffic that is kiddie porn. On top of that, what are we talking about here? What is this definition of o kiddie porn? Does that number include subjects that "appear" to be underage? If I know anything, I know that the government will skew numbers to fool others and even themselves; because that's how you get money and how you build your little fiefdom.
The "small picture" you would get, is very well probably the 80% we are talking about, e.g., 80% of all traffic that is associated with kiddie porn and is also unencrypted because the perpetrators are unsophisticated is actual kiddie porn traffic, which says nothing whatsoever about the overall amount of traffic that is kiddie porn. On top of that, what are we talking about here? What is this definition of o kiddie porn? Does that number include subjects that "appear" to be underage? If I know anything, I know that the government will skew numbers to fool others and even themselves; because that's how you get money and how you build your little fiefdom.