The graph below shows the production levels of the main kinds of fuel in the UK between 1981 and 2000.

The line graph illustrates the

production

levels of the main kinds of fuel in the UK from 1981 to 2000.

Overall

, all

rates

decreased except for the

rate

of coal.

Moreover

, the

production

level

of

petroleum

was always the highest. Moving to a detailed analysis, the

production

level

of

petroleum

ranked first (90

energy

units

)

while

the

rate

of coal

production

was 80

energy

units

in 1981. Over the next 5

years

, the

rate

of

petroleum

production

increased significantly by 50

energy

units

.

However

, the

rate

of coal fluctuated and declined to 60

energy

units

. After 10

years

, the

rates

of

petroleum

fluctuated

while

the coal

rates

decreased slightly by 20

energy

units

. From 1996 to the end of the

period

, the

rates

of

petroleum

production

almost remained stable at 140

energy

units

,

whereas

the

rate

of coal again declined and finished the

period

at 35

energy

units

. In terms of natural gas, the

rate

of

production

was 40

energy

units

at the beginning of the

period

. Over the next 10

years

, the

rates

remained stable at the initial

level

before climbing to 80

energy

units

in 1996. After 5

years

, the

production

level

increased steadily and finished the

period

at 100

energy

units

.