The given pie charts represent the modes of energy production in Spain in different years.
From the given data, it can be observed that there has been a considerable drop in demand for the likes of oil and coal, while modes of energy such as renewable, nuclear, gas, and other miscellaneous forms experienced a steady increase.
The most notable change is the decline in dependency on conventional methods to produce energy, namely oil and coal. The percentage of energy produced via oil dropped by 4% from 27% in 2008 to 23% in 2017. However, coal witnessed an even sharper decline, decreasing by a whopping 11% from 28% in 2008 to 17% in 2017.
The decline of conventional methods, such as coal and oil gave rise to alternate modes of energy. A marginal increase in gas was observed rising by a mere 1% between 2008 and 2017. On the other hand, nuclear and renewable energy saw considerable improvements – increasing from 11% to 17% and 9% to 16% respectively. Miscellaneous sources also improved by 3%, jumping from 3% to 6% during this period.