Here is an interesting link, to a Facebook page for the National Center for Cold Water Safety. I looked at the recent post on the page that listed a number of incidents in the last 30 days. All in the US though one in Alaska. Some of the people who capsized made it because they were gotten to very quickly, a few did not. But what is striking in this article is how short a time it took before the ones who did get rescued reported that they were unable to do much to help themselves. Way less time than actual loss of life.