下麵是天然氣2008到2016的價格變化

http://www.infomine.com/investment/metal-prices/natural-gas/all/

下麵是天然氣1976到2008的價格變化 in 1976 dollars。

http://www.eia.gov/pub/oil_gas/natural_gas/data_publications/cost_indices_equipment_production/current/coststudy.html

(用internet上給出的計算，現在天然氣 1.62 相當於1976 0.38。

http://www.dollartimes.com/inflation/inflation.php?amount=1&year=1976 )