Hi, the data is coming from the wikipedia page linked at the bottom. I haven't tried to check if the data was correct or not. But for scuba diving, the page refers to a study by British Sub-Aqua Club. "UK Diving Fatalities Review" and states that there are 5 'micromort' per dive, which means 5 death for one million dives, which is a frequency of death per dive of 0.0005%.