Before revision: The first successful landing was done in December 2015, since then several additional rocket stages landed either at a landing pad adjacent to the launch site or on a landing platform at sea, some distance away from the launch site.
After revision: The first successful landing was done in December 2015, since 2017 rocket stages routinely land either at a landing pad adjacent to the launch site or on a landing platform at sea, some distance away from the launch site.