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tedster - 3:53 pm on Oct 5, 2007 (gmt 0)
Although it is true that gradually users are becoming more sophisticated and using longer searches, it's those "approximations" that I suspect. < end spliced section >
I see what you mean - the gradual decline seems nearly universally pervasive. I think it's more likely to be an artifact of the tool itself - have you noticed the disclaimer at the bottom of the page? Google Trends aims to provide insights into broad search patterns. Several approximations are used when computing your results. Please keep this in mind when using it.