Probably about 7 or 8 times over 13 years of being a courier. Since that included over half a million miles of riding and well over a dozen bikes it's not too bad.
Only injury (other than bruising) happened when some idiot did an illegal u turn in front of a car which massively over-reacted, swerved across two lanes and clipped my front wheel. Have to say that one hurt a bit..... I s'pose landing under the handlebar of a 500lb motorcycle would though. The scar across my middle looks "cool" though (Scares kids is more like it.).....
Came off at Snetterton too but that was a case of too little horsepower combined with Japanese 600s crossed with stupidity and a unhealthy dose of testosterone. Now ride with a little note on the tank with the cost of a clutch and bodywork written on it.