The first pie chart displays the shares of global energy consumption by type in 2005. The second pie chart illustrates the distribution of world oil reserves (in billions of barrels) by country in the same year. The line graph displays world oil prices, in US dollars per barrel, from 2000 to 2025. Overall, oil was the most widely consumed energy source, and Saudi Arabia held the largest share of reserves. Oil prices peaked around 2005 – 2006 before falling, stabilizing, and then edging up.
In terms of consumption, oil accounted for 37%, followed by coal (28%) and natural gas (23%). Nuclear and hydroelectric power each made up 6%, the smallest shares.
As for 2005 oil reserves, Saudi Arabia, Canada, Iran, and Iraq held 20%, 14%, 10%, and 9%, respectively, just over half in total.
Turning to prices, values stood at roughly US$30 per barrel in 2000 and dipped to their lowest point in 2002 (just under US$30). They then climbed sharply, reaching about US$55 in 2005 and almost US$60 in 2006. Thereafter, prices fell, dropping to below US$50 by 2010, and remained broadly stable for roughly a decade, and inched up to around US$55 in 2025.