The given line graph shows the ____ levels of three main ____ of fuel (petroleum, coal, and natural gas) in a particular European country, from 1981 to 2000 Overall, it can be seen that petroleum was by far the ____ produced type of fuel, while the ____ of natural gas being produced increased rapidly. In 1981, the amount of petroleum ____ was around 100 tonnes. It increased steadily over the next few years to reach around 130 tonnes before ____ back to just under 100 tonnes in 1989. It then rose up again to around 130 tonnes in 1995, where it ____ slightly until the end of the period Coal was the second most produced fuel in 1981, at 80 tonnes. Coal production remained ____ until it dropped suddenly down to around 50 tonnes in 1985. It rose back up to just over 70 tonnes in 1987 before slowly declining over the next 13 years to just under 40 tonnes. The production of natural gas remained unchanged at about 40 tonnes until around 1991 when it began to rise ____.

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