You can download all keywords in the "Keyword ideas" list to as a .csv (Excel-compatible) spreadsheet. Want a better idea? Selectively add the most promising keywords to a plan (essentially, an ad campaign), then download the plan as a .csv file, DeMers says.
To add a desired keyword to a plan, click the double arrows to the right of the keyword. When you're ready to download all keywords in a plan, click the download icon to the far right of the screen, near the "Review estimates" button.
In the next screen, check the historical statistics box; this will give you the most important data for keyword research. Check the "Segment by month" box, too, to see how your keywords performed in the previous 12 months.