Wow a whole 6%. I dumped Apple after the new Mac Pro came out and switched everything over to Windows 10.
From this article, over 7.5% market share in 2015 up from 6% in 2014 for Macs. From another article, 6% growth for each of last 3 years for Macs:
http://www.voanews.com/content/apple-defies-industry-trend-as-pc-sales-fall-again/3143303.html