I don't often cover these reports but I figured it would be nice to compare year end search ranking market share from December 2013, which was recently released and to last year December 2012 market share.
Google is of course the winner but they aren't really gaining much share year-over-year. Microsoft has, as is Yahoo - which are both powered by Bing. So In December 2013, Google has 67.3% share, while Bing powered 29% of search. AOL is powered mostly by Google, so if you add that in, that brings Google to 68.6%.
Here are the charts from the two years.
Forum discussion at WebmasterWorld.