No response, did find this
"Martin-Baker has manufactured over 68,700 seats since they began in 1947. As of today, just over 6,900 lives have been saved with Martin-Baker seats.
That works out to approximately 1 in 10, or 10%, of our seats that are used
in an emergency ejection from an aircraft."
10% seems like a lot. If 10% of all seat belts saved lives, that would be a bunch of wrecks.
Arf