Given the task definition and input, reply with output. You are given a sentence in English. Your job is to translate the English sentence into Japanese.

Well, you know, our own Earth has oxygen in the atmosphere to 20 percent by volume.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
私達の住む地球には酸素があり大気の20% を占めています