Collocations for fluctuate - verb

considerably, greatly
dramatically, widely, wildly
Prices have fluctuated wildly in recent years.

constantly
constantly fluctuating patterns

according to
Traffic congestion fluctuates according to the time of day.

around
The number of students fluctuates around 100.

between
The number of unemployed fluctuates between two and three million.

Fluctuate is used with these nouns as the subject:
currency, fortune, population, price, rate, weight