Looking at the charts, it is immediately obvious that there was relatively little change in the proportions of the other fuels used to generate energy from 1980 to 1990, except for hydro. It is also noticed that Coal was the main source in both years.
In 1980, 42% of energy production came from oil and the figure decreased to 25% in ten years latter. By contrast, the proportion of natural gas used as a source for generating energy, which remained almost stable at 26% in 1980, with 25% in 1990. However, coal experienced a slight decrease from 22% in 1980 to 27% in 1990, which overtook the rate