Google says those should be going away as its "BigDaddy" infrastructure comes online. To access this data, you can go here and then enter your keyword phrases. You will then see this data charted for you.
Bigdaddy" Infrastructure Live, Data Center Open For Feedback thread at the Feedback on Bigdaddy data center where he covers how the data center got
its name, how this is an entire new infrastructure for Google web search
coming online, how it...
Google's new 'Bigdaddy' web search infrastructure is now live at special data centers and open for testing and feedback before migrating and becoming 'regular Google' in the next month or two. Google's Bigdaddy Data Center.
Google Wants Your Feedback About Their New "Bigdaddy" Data Center - Google's Matt Cutts offers a FAQ of sorts with information about the new "Bigdaddy" data center that Matt mentioned about a month ago in a response to a post on his blog.