Final answer:
The provided information does not specify the percentage of energy imports by the United States.
Step-by-step explanation:
According to the provided data, the U.S. consumes approximately 21% of the world's oil production per year, despite having only 4.25% of the world's population. However, the question specifically asks about the percentage of energy needs that the United States imports.
Unfortunately, the provided information does not explicitly mention the percentage of energy imports. Therefore, it is not possible to determine the exact percentage based solely on the given data.