There's some noise, but the trend seems clear to me. The median starts out oscillating around the '1' line, but by 2008 - 2014 it barely touches the line at all

There's some noise, but the trend seems clear to me. The median starts out oscillating around the '1' line, but by 2008 - 2014 it barely touches the line at all. There's a drop from 2014-2016, but it's too early to say if it's temporary like the drop between 1997-1998 (El Niño?) We can say a priori that the sea level is not a random walk. A random walk is boundless - the sea level is not going to suddenly rise 100 meters.