-33.67% is the change from 977 to 648
Calculation steps:
[( 648 - 977 ) ÷ 977] x 100 = -33.67%
Formula
Percentage change = [(648 - 977) / 977] x 100
Subtract the new number by the original number
648 - 977 = -329
-329 ÷ 977 = -0.3367451381780962
-0.3367451381780962 x 100 = -33.67%