They don’t come out with the list for the year until it is complete.
For example, they released “A Year in Search - 2015” at the end of last year.
Around the end of December 2016 or early 2017, you can search for “top searches google” and you’ll probably find their Zeitgeist for 2016. You can even search similar permutations using “zeitgeist” with google and you’ll find it too.
Google Trends - Top Charts is also quite handy as well.