I am guessing that you are trying to summarize some data by year. To do this, you should have the Year in the ROWS section and the values in the VALUES section.
You can see an explanation of this in the video tutorial: Expert Skills Lesson 5-3 Understand pivot table rows and columns.
If there are any other fields in the ROWS section, the pivot table will automatically try to create subtotals for these, so the most likely solution is to remove anything else from the pivot table apart from the rows and values.
If you have already done this, it is likely that one of the entries in your Year column has an extra space before or after the year. Even though you can't see it, this makes the value slightly different so Excel will treat it as a separate total.
I hope you're now able to solve the problem, but please feel free to reply if you're still having trouble. If you'd like to attach a copy of your workbook, I should be able to figure out the problem (instructions here).
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