The dollar traded at pretty stable levels through the 2020-2024 period, and most countries that could did similar things to their currencies as we did.
To be clear, it doesn't make sense to say "the dollar traded at pretty stable levels". You need an FX pair to make sense.
There are three big, floating currencies in the world: USD, EUR, and JPY. These currencies are overwhelming used for international trade. The USD<->EUR FX rate has been quite stable (~1.10) for about 10 years. However, the JPY<->USD FX rates has risen dramatically since 2022.
Oh that's a great point! We have achieved diff^5 at last!
Now that I think of it, we could even stretch it one more level. In practice UTC is "realized" as a "best of" diff to atomic clocks in labs around the world, which are themselves diff against a fixed time point, as you pointed out. So that realization technically changes when the official UTC bulletin[1] is published by BIPM. So diff^6!
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