If you registered before in Google Search History service you’ll be able to see some statistics about your usage of Google with Trends. This is pretty interesting, I’m registered since october 2005 and in the stats I can see that I’m doing at least 100 search daily excepting thursday and friday. Of course you can click on numbers and see more details about the month, day or hour, but in the screenshot you cannot :). Pretty interesting specially that I don’t use bookmarking service, I just keep my bookmarks there in google.
http://googling.phpmagazine.net/upload/2005/12/search-trends-thumb.png