Why do actual percentage of power produced by hydroelectric station is decreasing?

The actual percentage of power produced by hydroelectric stations is decreasing due to several factors, including climate change, which leads to altered precipitation patterns and reduced river flows. Additionally, sediment buildup in reservoirs can diminish water storage capacity and efficiency. Increased competition from other renewable energy sources, such as solar and wind, is also contributing to a decline in hydroelectric power's share of the overall energy mix. Furthermore, aging infrastructure may require upgrades or replacements, impacting overall output.