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once a year vs once per year

once a year vs once per year which is much better to use in a sentence. Which is more popular in English form?

Looking on the internet deeply has found these results:

once a year is the most popular phrase on the web.

once per year

112,100,000 results on the web

once a year

1270,000,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:

  • It shall meet at least once per year.
  • That ratio shall be updated at least once per year applying industry best practice guidelines.
  • The frequency proposed is once per year.
  • The competent authority shall monitor at least once per year that the threshold defined in the first subparagraph is respected and report its findings to ESMA.
  • The control referred to in point (d) shall take place at least once per year.
  • Compliance with the reproducibility limit must be checked at least once per year using the procedure described in Annex III(a).
  • Sensory checks on the organoleptic characteristics are as a rule made once per year.
  • It shall meet at least once per year in the presence of a representative of the Commission.
  • The Regional Coordination Meetings may be convened once a year.
  • Those guys only come out once a year.
  • We show them once a year.
  • Secondly Oncidium only flower once a year.
  • The parents visit their children once a year.
  • My Dad would throw a shin dig once a year.
  • Phals only bloom once a year.
  • The mountain festival comes once a year

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