During 1981 to 2000, The UK had produced three main kinds of fuel, those are petroliums, coals, and a natural gases.
In petroliums production, it started to produce about 100 units then during 1984 it peaked up to 140 units and became stable for a while but in the end of 1980s the total produced had fell down to 100 units and became one of the lowest amount of petroliums production. After 1991, the production began to rose up again and increased tons of petrolium unit and slightly increased after since in the middle of 1990s. At the end of 2000, the amount of produced petroliums had the approximately total in 1984.
In coals production, it started lower than a petroliums for about 20 units and then suddenly dropped to 40 units during 1983 to 1984 then peaked to 60 units and became stable. After the total production became stable, the production started to slowly declined to 40 units again in the middle of 1990s and stop declined until 2000.
In natural gases production, it started at the lowest amount among all with only 40 units but since 1981 it slowly increased and had risen up more in 1991 and the total produced became 100 units at the end of 2000.
In conclusion, petroliums production had the highest total produced unit of all three main kinds of fuel production since 1981 to 2000, while natural gases production had overcomed the coals production since 1991.