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Anybody know what causes the fluctuation??
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Yes, it's most likely because Google is constantly changing and "tweaking" their algorithm. And as they find more backlinks for sites, more people add and change their web pages, the search results will constantly change.
Google constantly tweaks the ranking criteria--sometimes they may put more emphasis on link text, sometimes more on keyword density, more on title tags, etc. etc. I call this "turning the knob" back and forth to get better, more relevant search results.