Definition: In this task, you are given a statement spoken by a politician in natural language. Your task is to generate the subject of the discussion for the given statement. The subject generated is not necessarily a part of the given input. Your answer should contain one or more words.
Input: Historically, the Social Security tax has been assessed on about 90% of U.S. income. Now it captures 83% because theres been such a growth of income among the highest earners.

history