Revenue, classified by the major geographic areas in which our customers are located, was as follows:
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| Year Ended June 30, | 2013 | 2012 | 2011 | |||||||||
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United States (a) |
$ | 41,344 | $ | 38,846 | $ | 38,008 | ||||||
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Other countries |
36,505 | 34,877 | 31,935 | |||||||||
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Total |
$ | 77,849 | $ | 73,723 | $ | 69,943 | ||||||
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| (a) |
Includes billings to OEMs and certain multinational organizations because of the nature of these businesses and the impracticability of determining the geographic source of the revenue. |