The line graph illustrates the trends in fuel production for petroleum, coal, and natural gas in a European country from 1981 to 2000.
Overall, petroleum remained the most produced fuel throughout the period, despite some fluctuations. In contrast, natural gas production rose significantly, while coal production experienced a substantial decline by the end of the period.
In 1981, the production of petroleum was approximately 100 million tonnes, making it the most produced fuel. This was followed by coal at 80 million tonnes and natural gas at 40 million tonnes. By 1985, petroleum production had increased to about 130 million tonnes, after which it experienced fluctuations and eventually decreased to 120 million tonnes by 2000, still maintaining its position as the most produced fuel.
Coal production, on the other hand, showed a downward trend. It declined sharply to 50 million tonnes in 1985, rose slightly to 70 million tonnes, and then dropped to 40 million tonnes in 2000, becoming the least produced fuel among the three by the end of the period.
Natural gas production remained stable at 40 million tonnes from 1981 to 1994. However, it saw a significant increase thereafter, more than doubling to over 80 million tonnes in 2000. This dramatic rise positioned natural gas as the second most produced fuel, surpassing coal by the end of the period.