This chart shows the Historical World Reserves-to-production ratio of Natural Gas - 1980 onwards.
Current World Reserves-to-production ratio of Natural Gas: 60.35 Years
What Does Reserves to Production Ratio Mean?
A ratio indicating the remaining lifespan of a natural resource. This ratio is expressed in terms of years, and is used in forecasting the future availability of a resource to determine project life, income, employment etc. While applicable to all natural resources, it is primarily used in the oil and gas industry.
RPR = amount of known resource/amount used per year