Google's advertising revenue from 2001 to 2013 (in billion U.S. dollars)

  Advertising revenue in billion U.S. dollars
2001 0.07
2002 0.41
2003 1.42
2004 3.14
2005 6.07
2006 10.49
2007 16.41
2008 21.13
2009 22.89
2010 28.24
2011 36.53
2012 43.69
2013 50.58
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This statistic displays Google's advertising revenue since 2001. In 2013, Google's ad revenue amounted to almost 50.58 billion US dollars. In 2011, Google's revenue in that category had a year-on-year growth rate of 25 percent. Advertising is Google's main source of revenue.

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You can find additional information about this statistic on statista.com
http://www.statista.com/statistics/266249/advertising-revenue-of-google/