-33.74% is the change from 975 to 646
Calculation steps:
[( 646 - 975 ) ÷ 975] x 100 = -33.74%
Formula
Percentage change = [(646 - 975) / 975] x 100
Subtract the new number by the original number
646 - 975 = -329
-329 ÷ 975 = -0.3374358974358974
-0.3374358974358974 x 100 = -33.74%