The pie charts compare six types of electricity in terms of their energy production in the years 1985 and 2003.
Overall, it is clear that the proportion of natural gas, coal, and other renewable sources saw a carrying level of increase, while oil, nuclear, and hydrogen decreased noticeably over an 18-year period. It is worth noting that, despite a noticeable drop, the most energy was produced from oil all over the period.
In 1985, oil was the primary energy source (52%), nuclear (22%), and natural gas (13%) accounted for the vast majority of total energy production. By contrast, coal, hydrogen, and other renewable sources stood at 8%, 4%, and 1%, respectively.
By the year 2003, the percentage of energy coming from both natural gas and coal had grown, with the former rising by 10% and the latter by only 5%. Unlike these two, there had been marked declines of 13% and 5% in the generating energy of oil and nuclear. While other renewable sources saw a slight rise of 3%, hydroelectric power remained the same throughout the period.