Google has released a dedicated page for their annual year in search. Here you can find the top searches and trends in different categories and they have highlighted some of the major events of 2014 so you can find out more about them and see their metrics.
Looking at the information the #1 search for the year was Robin Williams. He was a very famous actor and comedian that passed away in August. Following Robin Williams was the World Cup right below that was Ebola.
How about tech stuff? The top tech search term was the iPhone 6, followed by the Smasung Galaxy S5 and then the Nexus 6.
Take a couple of minutes and check out the page Google has created, there is lots of information there and it really shows you what was going on this past year. They have also put together a Year in Search 2014 video.