Over the course of a year, the population of opossums in Dallas increased from 300000 to 321000. What was the percent increase of the population of opossums?

Express your answer as a percent.

Opossums are very common in the Dallas area and are frequently confused for massive rodents, though they are actually more closely related to koalas than rats. A common misconception about these shy animals is that their fear of humans leads them to avoid urban areas. Opossums are very comfortable around the conveniences of ready-made shelter and food provided by residential homes, even if they evade contact personally. They eat everything and anything, which is why it is important to keep a lock on your trash bins and avoid keeping pet food outside. Opossums are one of the most common wildlife species found in residential attics and crawlspaces. They are the size of a large cat, have gray hair and a long, scaly tail.

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