The line graph compares the percentage of total energy consumption derived from oil in Iceland, Sweden, Italy and Turkey over the period from 1966 to 2006.
Overall, oil consumption declined substantially in Sweden and Iceland, whereas Turkey experienced a steady increase throughout the period. Furthermore, although Italy remained one of the most oil-dependent countries, Turkey recorded the highest proportion by the end of the period.
Turning to the countries with the highest proportions of oil use, Italy and Turkey displayed contrasting trends over the period. Italy began at 90% in 1966 and rose slightly to a peak of approximately 95% in 1976, before declining gradually to around 85% by 2006. By contrast, Turkey started at 60% and increased steadily throughout the period, eventually reaching just under 90% in 2006.
As for the remaining two countries, both Iceland and Sweden experienced significant declines in their reliance on oil. In Iceland, the proportion fell from 80% in 1966 to 40% in 1986, before decreasing moderately to approximately 35% by the end of the period. A similar pattern can be seen in Sweden, with the figure dropping from around 70% to 30% over the first two decades, after which it remained stable for ten years before falling further to just 20% in 2006.