Mentioned graph illustrates different kinds of fuels produced by UK since 1981 to the year 2000. Overall, 3 type of fuel produced by UK, Natural gas production has surged drastically, petroleum production also increased, whereas coal production has dropped.
In 1981, Natrual Gas production as near 40 tonnes and there was a very little growth till 1991. After the 1991 gas production inscreased significantly and by the year 2000 it touched 100 million tonnes.
Petroleum production was near 90 million tonnes in year 1981, in 1983 it touched 140 million tonnes and remained constant for next 4 years, but from 1987 it start dopping and declined sharply. In year 1989 it touched 100 million tonnes and for next couple of year production did not increased. By year 1992 it started rising again and by year 200r it touced 140 million tonnes of production.
Coal is the only product that declined and gone below the 50% since the 1981 period to 2000.