The provided line graph illustrates the consumption of renewable energy, accounting for the total energy in six different countries: namely, Finland, Denmark, France, Germany, the U.S., and the U.K., over a forty-year period commencing from 1971.
Overall, there are pronounced variations in renewable energy usage among the surveyed countries. Also of note is that Finland and the U.K. consistently had the highest and lowest figures throughout the years.
To elaborate, in 1971, around 25% of the total energy used in Finland was renewable energy, and this number slightly decreased to just under 24% 40 years later; despite this, Finland still ranked first at the end of the period. The figures for Denmark and France, however, witnessed a positive trend, rising from 15% and 8% to 15% and 17%, respectively, over the same period.
Regarding the other categories of the chart, the percentage of renewable energy consumed in Germany recorded a gradual growth from 5% to roughly 13% by 2011. The figures for the U.S. also grew, with some oscillations in the first 25 years before remarkably growing from well under 5% to just under 20% in 2011. Finally, starting at nearly 0% in the overall use of energy, the consumption of renewable energy in the U.K. negligibly increased to 6% in the last year shown, representing the lowest position on the entire graph.