The provided line chart illustrates the production levels of three main fuels in the UL over Nineteen-Year time span, from 1981 to 2000.
A contrasting trend in production rate is evident, with petroleum consistently maintained its high production throughout the years, while the production of coal experienced a significant decline.
In 1981, Petroleum commenced a substantial amount of 95 million tons, the production have seen a marked increase to an impressive 140 million tons by 1986, but the number saw a decline, plummeted at 100 million tons in 1991, before rebounding ultimately to over 140 million tons by the end of the period.The production of coal fuel demonstrated a notable figure at 80 million tons in the first year, before sharply reducing to below 40 million tons by 1984, the production saw a resurgence to 60 million tons of coal, however, in the subsequent years showed a steady decline, finishing below 40 million tons. Becoming the limited fuel resources among the main fuels. Conversely, Natural gas exhibited a dramatic growth, despite its initially sluggish trajectory, escalated from nearly 40 million tons before edging up to above 100 million tons by the end of the observed year.