Xerox Employees are ~16% happier this year

According to careerbliss, Xerox employees are over 16% happier than they where a year ago.  Of course they only have a really small sampling of reviews.  Anyone what to wiegh in on this?

http://www.forbes.com/sites/kathryndill/2014/08/21/the-companies-with-the-biggest-jumps-in-employee-happiness/