Cosmetic surgery is gaining in popularity every year. There is nothing wrong with the tense used here. The present continuous tense also indicates changes or development.
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Reegis1) Cosmetic surgery is gaining in popularity every year.Informally used in the sense of #3 in your reference. "Every year" is used to mean "year after year."
ReegisThe Present Continuous time has the three basic meanings listed hereYes, but what about the 528 other meanings?