There are no statistics because this has never been reported before. One of the key points that animal rights activists used to shut down the Sea World orca per

There are no statistics because this has never been reported before. One of the key points that animal rights activists used to shut down the Sea World orca performances was that there were no reports of wild orcas ever attacking humans, indicating that the Sea World orcas must be extremely stressed. Wild orcas have had many friendly interactions with human boats, and have even successfully stolen fish from fishing boats many times, but as a layman who follows orca intelligence research as a hobby, I've never heard of attack-like incidents like this article describes before. And the scientists interviewed in the article evidently haven't either.