The following is a very good report on why Google analytics reports for keywords are increasing showing a large percentage as "not provided". This article is a direct copy of the article written by Mike Allton at http://socialmediatoday.com/mike-allton/1209631/why-google-hiding-your-keywords .
More and more business owners have started to recognize that Google is no longer providing all of the keyword data that it used to within Google Analytics. If you monitor your website analytics regularly, you may have noticed that your Keyword report is showing more (not provided) than other keywords. This has search engine marketers and business owners more than a little concerned! Why aren't these words being provided, and what can we do about it?
What's the big deal?
A large part of Internet marketing has to do with keywords. A keyword is a word or phrase that an individual types into a search to retrieve a set of results. As businesses, we want to identify what keywords our potential clients are using to find businesses like ours, and then perform actions to increase our chances of being ranked higher for each specific keyword. This is the cornerstone of search engine optimization.
For example, one of the keyword phrases that I target is "St Louis Internet Marketing Company" as I have determined that my target customers may use that phrase to find a business like mine.
That's fine that I think that's a good keyword phrase, but is it really? Will customers actually be looking for that and visit my site? This is where the Google Analytics Keyword report is so valuable because it will show you the keywords that actually drove someone to your site. If I find a lot of visits from my target keyword then I know I chose well. If not, it may be because either my site is not ranking well enough for that phrase, or there simply aren't enough people actually searching on that phrase - either way, I have some more work to do.