From the Statistical Abstract of the United States and the article "Average Salaries in the NBA, NFL, MLB and NHL" by J. Dorish, published on the Yahoo! Contributor Network, we obtained the following data on average professional athletes' salaries for the years 2005 and 2011.

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Average salary (Smillions) Sport 2005 2011 Baseball (MLB) Basketball (NBA) Football (NFL) 2.48 4.04 1.40 3.31 5.15 1.90