Looks like 2021 was another great walleye hatch. This report is quite detailed and explains how they arrive at the numbers.
https://www.greatlakesnow.org/2021/...SailinCW4N9rbym1TpbI5eh7NFxsSTEiyHA4ichXrIJ9I
https://www.greatlakesnow.org/2021/...SailinCW4N9rbym1TpbI5eh7NFxsSTEiyHA4ichXrIJ9I