You don't get to hear about the "failures", so it would be hard to compile those stats.
You might want to approach a few VCs and see if they want to share ballpark figures.
The failure rate is pretty high ~90%
http://futurestartup.com/2011/12/18/globally-nearly-90-startup-business-fails-only-10-out-of-100-sustain-at-last-what-leads-this-10-startup-to-success/ Due to another paper 80% of IT startups are failing in the first year.
this one http://www.statisticbrain.com/startup-failure-by-industry/ tells that 37% of IT startups are still alive after 4 years.
Also it on depends what do you mean under 'success' and 'failure'. Only 1% of startups are earning much, like 10% are earning enough for living and like 90% pretty nothing.
So absolute success rate is like 1%
Well I have come across various everything from 70% to 95% (95% for Indian startups). But would you really simply go by a statistic on this? Frankly, no sane risk averse person would ever think of going for a startup, doing a well paying job is far less hassle any day and their is far more peace of mind.
But hey, you gotta be a little crazy to think your startup will be among the few successful ones.