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How to Calculate the Percentage of Annual Decline

By Motley Fool StaffUpdated Apr 29, 2025 at 11:36 PM

Key Points

  • Calculate annual % change by dividing start by end value, raising to inverse years, minus one, times 100.
  • Ex: a drop from $15M to $10M over 2 years is a 18.4% average annual decline.
  • This calculation helps compare data even when time intervals vary.

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