Looks like they need to work a bit on the user interface...

Clicking on the "" many times will eventually "scroll" back in time
to older contests.

As for clicking on "older contests", I also could not change the year -
it just brought me back to the new format viewer.

Overall, I'm very happy with many of the new features of the SSA
website, such as national and state records. I suggest sending an
email to the webmaster describing the problem - and be sure to provide
positive feedback as well.