The line graph illustrates the levels of fuel production (Petroleum, Coal, Natural gas) in the UK from 1981 to 2000.
Overall, it is clear that Petroleum stood at the leading level and remained the dominant category for the entire period. Conversely, Coal production demonstrated a downward trend, while Natural gas experienced the most significant growth compared to others.
The figure for Natural gas began with the smallest share at almost 40 energy units in 1981 and then fluctuated at around the same level before slightly increasing in approximately 1990. It overtook Coal in around the middle of 1991 and then steadily rose for the rest of the years. In contrast, Coal started at a two times better position at almost 80 energy units in 1981, but it sharply dropped in around 1984 and then partially recovered by 1986 (approximately 60 units) before decreasing steadily until the end of the period.
Regarding Petroleum, this figure stood at around 90 energy units in 1981 and increased gradually, achieving a plateau at almost 140 units by 1984. This trend remained unchanged for the next 4 years and then declined almost to the starting level (approximately 100) by 1990. However, it recovered by 1995 (almost 140 energy units) and then fluctuated almost around this number for the rest of the years.