assuming most swimmers swim more than 20 times a year, which I think is reasonable
Those numbers look like general population numbers (and since it looks like a lot of drowning deaths are due to ineptitude, it seems unclear to me whether the yearly risk for frequent swimmers is higher or lower than for non-frequent swimmers). Instead of ‘all drowning,’ the 1 in 83,534 number, one should probably use the ‘in swimming pool’ number, which is 1 in 452,738.
Those numbers look like general population numbers (and since it looks like a lot of drowning deaths are due to ineptitude, it seems unclear to me whether the yearly risk for frequent swimmers is higher or lower than for non-frequent swimmers). Instead of ‘all drowning,’ the 1 in 83,534 number, one should probably use the ‘in swimming pool’ number, which is 1 in 452,738.