Language moves on. Some of the same words consumers searched on in 2005 can have vastly different meanings when searched on today, or they might not have existed. For example, some words spelled the same might have different meanings, while other words have different meaning with slightly different spelling such as Microsoft "Kinect," rather than "connect." Then there's the new words all together like "iPad" that didn't exist a year ago. Ian Saunders, managing director at Crystal Semantics, says language changes about 5% annually.