The provided line graph illustrates the production levels of the crucial fuels in the UK over a span of 19 years, starting from 1981.
Overall, the data reflects a fluctuating production rate for petroleum, throughout the entire period, followed by coal with a downward trend, and surpassed by natural gas which showed a notable increase in production levels.
Looking at the data sets in more detail, Petroleum displayed the most significant rate fluctuations among the three fuels. Starting at around 90% in 1981, hovered at 140% from 1984 to 1987, then slightly decreased to approximately 100% by 1991, reaching over 140% by the conclusion of the period in 2000.
Coal witnessed a decline in production to below 40% in 1984 and peaked at nearly 60% in the mid-1990s before gradually falling. Conversely, natural gas showed a consistent rise in production rate, starting at 38% in 1981 and steadily climbing up to about 100% at the end.