The given information regarding to the petroleum, coal and natural glass has been depicted during 1981 and 2000.
Petroleum has maintained its highest position between the illustrated era. It was stared at 100 millions tonnes , boosted 20 million tonnes at the end. However, it was slightly fluctuated from 1982 to 1999.
Initially, coal was double cost (80 million tonnes) as compare to Natural glass ( 40 million tonnes) . Nevertheless, coal enhanced around 90 tonnes whereas, Natural gass diminished almost at the same starting rate of coal at the end. Although coal was followed decreasing trend all the years but Natural gass stayed content many years and then rapidly rose dramatically till 2000.
Overall, petroleum and Natural gass both presented increasing trend while coal was showing decreacing trend.