Does anyone know what the success rate is for Kickstarter projects to actually deliver their products on time? After my absolutely terrible experience with Loc

Does anyone know what the success rate is for Kickstarter projects to actually deliver their products on time? After my absolutely terrible experience with Lockitron (I know they're not a Kickstarter project, but they are similarly funded) and some of the other horror stories I've heard, I just don't have faith that these types of projects for goods deliver on their promises.