U.S. Unemployment Rate
The short-term fluctuations in the graph are the result of cyclical unemployment that changes when economic activity is above or below its long-term potential. Over time, unemployment has returned to about 5%, which is the approximate natural rate of unemployment.
Source
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"US Unemployment 1890-2011."
http://en.wikipedia.org/wiki/File:US_Unemployment_1890-2011.gif
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