SO question - http://stackoverflow.com/questions/7313580/google-spreadsheet-summarize-grouping-by-year-and-month
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ABCDEFGHIJKLMNOPQRST
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mydateamountmonth
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01/01/200910.002009-01
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02/01/200913.002009-01
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01/02/200911.002009-02
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05/02/200912.002009-02
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08/02/200952.002009-02
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Sheet1
Pivot Table 1