they quadrupled
Past they conjugation of quadruple.
See all conjugations of quadruple

quadruple

In Australia, they tripled between 1992 and 2000; in the United Kingdom, they doubled; and in the United States, they quadrupled.
En Australie, il a triplé entre 1992 et 2000 ; au Royaume-Uni, il a doublé tandis qu'aux États-Unis il a quadruplé.
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