I would not advise doing this.
Sanity-Check time.....
What are your top 10 Search Terms for 2010?
My guess is that they're not worth printing.
However, I believe you can get this info. I believe the issue is that you did not put all of the appropriate query string parameters in your call.
But the BIGGER issue is what you're trying to achieve. I understand the business value of getting the top 10 Search terms, but I also understand the risk of exposing those terms to your customer base. I would take some time to think through whether you want to expose those terms or not.
IMO, you're better served syndicating the top ten Tags, and not the top ten Search Terms.