1. Open the Excel 2010 spreadsheet that holds your 2009 and 2010 data.
2. Click and hold the mouse on 'A1' above the first column and then drag the mouse to column 'C' and release the button. Right-click 'A' and choose 'Insert,' creating three new columns at the front of the spreadsheet.
3. Click cell 'B1' and type '2009.' Then click cell 'C1' and type '2010.' Click cell 'A2' and type in the first period for which you have data. This can be a day, week, month, quarter or any time period, less than a year, that you need. Continue down the column until you have added all your time periods.
4. Click cell 'B2' and enter the data that corresponds to your time period for 2009. Continue down the column, adding your data as you go. Repeat this process in column 'C,' but use the data from 2010.
5. Click any cell in your data table. Click the 'Insert' tab at the top of the screen, then click the 'Column' or 'Bar' buttons in the 'Chart' area, depending on whether you want your data displayed respectively, vertically or horizontally. Choose the 'Clustered Column' or 'Clustered Bar' chart buttons from the small menu that appears. Your chart, which will contain the 2009 and 2010 numbers side-by-side, will appear on the spreadsheet.
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