The current understanding of the composition of the universe suggests that about 68% of the total energy density is attributed to dark energy, while normal matter (including atoms, ions, and subatomic particles) contributes only about 5%. The remaining 27% is thought to be dark matter, a form of matter that does not interact with light or other electromagnetic radiation but exerts gravitational influence. It's important to note that these percentages are approximate and based on the best estimates and measurements available New scientific discoveries or advancements may lead to revised understanding in the future.