have been decreasing
Present perfect progressive conjugation of decrease. There are other translations for this conjugation.

decrease

intransitive verb
The number of crashes decreased by 27 per cent.Le nombre des accidents a diminué de 27 pour-cents.
Sales decreased 7% during the first half of the year.Les ventes ont diminué de 7 % durant la première moitié de l'année.
Collins French Electronic Dictionary © HarperCollins Publishers 2023
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Present:
Past:
Collins English Verb Conjugation Tables © HarperCollins Publishers 2023
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