Some most googled categories:
News
-Charlie Hebdo
-Paris
-Hurricane Patricia
People
-Lamar Odom
-Ronda Rousey
-Caitlyn Jenner
Musicians
-Adele
-Sia
-Eagles of Death Metal
Sport Events
-Copa America
-Wimbledon
-Tour de France
Movies
-Jurassic World
-Furious 7
-American Sniper
TV Shows
-Big Brother Brazil
-Jessica Jones
-Bigg Boss
You can check more categories and country specific statistics at the source
Source: http://google.com/2015
How was your year, ONTD?