The provided line chart illustrates the percentage of renewable energy consumption across six different countries from 1971 to 2011.
Overall, it is clear from the chart that the proportions in most countries generally increased despite some fluctuations over the 40-year period. Notably, Finland maintained the highest renewable energy usage, whereas the United Kingdom had the lowest figure throughout the period.
Looking at the group with considerable fluctuations, Finland held the dominant share in 1971 at approximately 25%. After fluctuating considerably for about 15 years, this country gradually recovered and finished at around 23% in 2011. Similarly, Denmark started at 15% and experienced noticeable fluctuations before rising steadily to approximately 17% by the end of the period. By contrast, the United States began at around 3% and increased gradually until the mid-1990s, after which its figure rose sharply to nearly 19% in 2011, becoming the second-highest among the six countries.
With regard to the countries with more stable trends, the United Kingdom increased steadily from just around 1% to slightly over 6% by the end of the period, despite experiencing small drops in 1976 and 2006. Meanwhile, France and Germany shared a similar trajectory, rising during the early years, declining slightly in the middle of the period, and then increasing again afterwards. However, Germany grew more rapidly and almost caught up with France, with both countries recording around 15% in 2011.