Believable?
Does anyone know the total number of ships of these classes existing in the world today?
If 200 ships represents 10% of the total, I really doubt the statictic. If 200 represents 0.1% it gets to be sort of believable.
Ships sink all the time & don't really make the news unless they cause a major oil spill or some other event. The crew of most ships are mostly foreigners and are primarily loners of some sort to choose that life. I doubt the loss of a ship will all hands would be front page news, esp. since the exact time & date would not be known with any certainty. More like a disappearance.