2016 information should be on your 2016 W-2. Don't worry if you haven't received it yet - you don't have to file until April 17th (2017) or later, depending on circumstances.
If many weeks pass and no W-2 arrives, give your employer a call. They're going to be the one issuing the form to you, so they'd know the whereabouts. Ask for HR/Accounting.
