That metric doesn't answer the same question. It isn't saying 18% of their needs are being met by renewables.
Because fossil fuels have higher in/out losses this is number is larger than usage. This metric is generally used to track decarbonization.
Using the IEA number you can see the hydro+solar+wind production is about 9.5% of the total, not 18%.
ChatGPT or you favorite LLM can explain in greater detail, just send it the plot image and ask.