Google says that there are about a billion sharks in the world but only 50k orcas. Meanwhile there are only about 10 humans killed by sharks a year. So zero recorded humans killed by orcas isn't that surprising. I wouldn't personally volunteer to swim with them.
Edit: granted, I didn't mention that it's typically great white, tiger and bulls that are life threatening among sharks. So it isn't really a billion versus 50k. Regardless, there aren't really that many fatalities by sharks per year.
Edit: granted, I didn't mention that it's typically great white, tiger and bulls that are life threatening among sharks. So it isn't really a billion versus 50k. Regardless, there aren't really that many fatalities by sharks per year.