Printed Unfamiliar report
Just as the Familiarity Report displays the percentage of respondents that know the song (did not push the Unfamiliar button), the Unfamiliarity report displays the percentage of listeners who did press the "Unfamiliar / Don't Know" button. The sum of these two scores (Familiar + Unfamiliar) will be 100%.
Unfamiliarity is a Rolling Average report. This allows you to specify start and end dates. Rather than display the Unfamiliarity values in a 4-week trend report, Unfamiliarity is displayed along with Positive Acceptance, Dislike and Burn for the test period you select.