Now explain it to me in Quatloos.

Straight currency conversions by international currency exchange value are misleading, it's better to get a general purchasing power parity comparison instead; for yen to the dollar, it's easy, just move the decimal place over two places(about 100 yen to the dollar). Currency exchange is useful for international trade purposes, but baffling when used to describe prices in a single county, especially over time.

Fenir said:

Straight currency conversions by international currency exchange value are misleading, it's better to get a general purchasing power parity comparison instead; for yen to the dollar, it's easy, just move the decimal place over two places(about 100 yen to the dollar). Currency exchange is useful for international trade purposes, but baffling when used to describe prices in a single county, especially over time.

Or just do a rough estimate of inflation by comparing with what an ounce of gold can buy (or the reciprocal, state the cost with gold). Usually not far off from inflation adjustment.

in that year the currency rate probably change rapidly by some events. It did increased in their local currency.

what interest me is why those foreign ships all sit down together

It's practically translated, if someone wants to bother with the references/citations be my guest.