Value of YC Companies

I read this article about the value of YC companies: http://ycombinator.com/nums.html. The line that jumps out at me is "The combined value of the top 21 companies is $4.7 billion [...] $4.7 billion / 210 = $22.4 million, so the average value of startups we've funded is about $22.4 million." In a similar way, Accel Partners could say something like: "The average value of the past ten companies we funded is about $10 billion", but take away Facebook and perhaps that number drops to 2% of that figure.

I am looking to find more discerning statistics about YC-funded companies. The truth of the matter is I am a huge fan of YC and some of the companies that have come out of there. And with 6+ years and 300+ startups that have gone through it, they do have meaningful statistics. This would help those companies that are interested in applying make informed decision on whether YC would be a good fit for it.