There should be a group for the constituent, for example CnBio_SortKey.
  1. Create a formula to check for the value: if CnAttrCat_1_Description = "2016" then 1 else 0
  2. Insert a maximum summary on this field for the CnBio_SortKey group
  3. Create a second formula to display yes/no: if maximum(@2016 Value Check, CnBio_SortKey) = 1 then "Yes" else "No"
  4. Insert the formula from step 3 into the report