Google AdWords announced that they have added "global trends" to the Keyword Tool. Global trends shows the search volume of a particular keyword phrase, charted over a 12 month historical period. To access this data, you can go here and then enter your keyword phrases. Then click the "Get More Keywords", after the page loads, on the right side, select from the "Show columns" drop down menu, the "Global search volume trends" option. You will then see this data charted for you.
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