I'm confused how to calculate how much money I lose to exchange rate compared to a few years ago.

NOW
> $1 = ?20.6
> $10,000 = ?206,000

YEARS AGO
> $1 = ?26
> $10,000 = ?26,0000

So I lose ?54,000 right? But to put that back into dollars should I use the old exchange rate or the current exchange rate? I can't figure it out.