What fraction of YC Startups succeed, given each successful fundraise?

Does anyone have any data on what fraction of YC startups go on to ultimately succeed/fail, at each successive fundraise? And I guess *how* well or badly they succeed/fail? I'm partly just curious, partly interested to try to get some kind of "expected value" of any options offered as part of remuneration. Any relevant dataset would be interesting to me - thanks!