The graph below shows the spending on research into renewable sources of energy in four countries between 1975 and 2000. Summarise the information by selecting and reporting the main features and make comparisons where relevant.

The line graph compare the experimentation expenditure on Renewable resource by Switzerland, Denmark, Spain and the united kingdom from 1975 to 2000. Overall, Switzerland had the maximum investment on renewable energy reseasch throughout the given period. While the expenditure by Spain and British fluctuated. However, it can seen that Denmark spending increased over time. In more detail, in 1975 none of the given countrysides contributed on study into renewables. Howerten, in next five years spending by all countries increase slightly and reached around 2$ for Switzerland and 1$ for remaining nations. After 1980, the spending by Switzerland consistently moved up to reach a peak of 6 $ in 2000. By contrast, the figure for Spain and the UK remained varied from 0$ to 1$ till 2000. Denmart's expenditure remained constant till 1990. However, in the next decade, it rose rapidly and reached 3. 5$ per person in 2000.