e/Reserves-to-production ratio

Information
has gloss	eng: The Reserves-to-production ratio (RPR or R/P) is the remaining amount of a non-renewable resource, expressed in years. While applicable to all natural resources, the RPR is most commonly applied to fossil fuels, particularly petroleum and natural gas. The reserve portion (numerator) of the ratio is the amount of a resource known to exist in an area and to be economically recoverable (proved reserves). The production portion (denominator) of the ratio is the amount of resource used in one year at the current rate.
lexicalization	eng: reserves-to-production ratio
instance of	c/Non-renewable resources