I don't know, but if that article is any indication, the problem is at the "anecdote" level rather than the "statistic" one. If I had to guess, I'd suspect lower than typical rates, but also so small a sample size that any study of it would be suspect.
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They were dangerous when they were designed in WW2, and they’re still dangerous. Absurd that people operate them.
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The ones in the uk are pretty old and prone to sinking http://www.dailymail.co.uk/news/article-2342226/Tourist-terror-amphibious-duck-bus-carrying-31-people-sinks-Liverpools-Albert-Dock-SECOND-time-months.html … https://www.google.com/amp/s/amp.theguardian.com/uk-news/2013/sep/29/duck-boat-passengers-rescued-fire-thames …
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The ones in Boston are converted WW2 vehicles!
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