The given line graph illustrates the proportion of oil consumption in four nations from 1966 to 2006.
Overall, there was a fluctuation in each country in the total energy use with the most general highest figures was Italy surpassing by Turkey in the last period, followed by Turkey, Sweden and Iceland.
In the comparison with Sweden and Iceland, although 2 nations had a similar downward trend over the period, the Sweden was always higher than Iceland as the lowest figure among all countries. Additionally, from 1967 to 1986, both of them were witnessed the significant descend, which respectively reached about 39 percent and 30 percent in 1986. At that stage, Sweden was seen the most dramatic shrink beginning in 1976. Plus, over the course of the next 20 years, while Sweden steadily decreased to approximately 35 percent, Iceland slightly surged to almost 31 after it fell to 21 percent in 2006.
With the two of the last lines, the amount of oil usage percentage in Italy was the largest, and it only exceeded by Turkey in the period before 2006. Otherwise, when Italy experienced the mild fluactuaton in the whole period, Turkey started with about 61 percent in the energy usage before hit a consistent upward trend reaching 89 percent at the end.