I see downvotes at the time I commented, which is unfortunate as ideas should be at least explored. Someone on the internet has been keeping statistics [0] that

I see downvotes at the time I commented, which is unfortunate as ideas should be at least explored. Someone on the internet has been keeping statistics [0] that do suggest the collapse in output happened in the 1980s. But on the other hand, the same stats show a steady decline in the number of companies from 1950 that was only stabilised after the collapse in output, so it is probably arguable that the high-production situation was unsustainable. Economics can be complex. [0] http://shipbuildinghistory.com/statistics/decline.htm http://shipbuildinghistory.com/statistics/decline.htm