Average Annual Percent Change

(coal)
  The average annual percent change over a period of several years that is calculated by taking the nth root [where n is the number of years in the period of interest] of the result of the current year's value divided by the value of the first year of the period; this result then has 1 (one) subtracted from it and that result is then multiplied by 100.
  Where V0 = the value for the base period.
  Vn= the value for the n th period.
  n = the number of periods.
  U.S. Dept. of Energy, Energy Information Administration's Energy Glossary

Energy terms . 2014.

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