"fluctuations" is correct and usable in written English.
You can use it to describe when a quantity or value changes constantly, often in an uneven way. For example, "The stock market often experiences large fluctuations in prices caused by economic uncertainty."
Exact(56)
So have seasonal fluctuations.
That should reduce portfolio fluctuations.
They're exposed to currency fluctuations".
Some are merely random fluctuations.
Despite this, currency fluctuations continue.
We do see fluctuations in sponsorship.
Currency fluctuations are hard to stomach.
What determines financial fluctuations and shocks?
Currency fluctuations have added further pressures.
River levels show considerable seasonal fluctuations.
Inventories do propagate and amplify other fluctuations.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com