Hi Jill,
I'm a big fan of footnoting reports when these sorts of issues arise. Footnote 1 would explain that in FY21 you began a project to better track bounces and opt-outs and footnote 2 would explain the calculation change made in FY23 and that previous numbers may have been falsely inflated. We would probably also have someone verbally present this to the President, the Board, or other stakeholders who may pay attention to the numbers, so they understand why the change is a positive even though it makes it look like the numbers dropped.
Lianna
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Lianna Bodzin
Assistant Director of Advancement Services
Colorado School of Mines
lbodzin@mines.edu------------------------------