-34.5% is the change from 971 to 636
Calculation steps:
[( 636 - 971 ) ÷ 971] x 100 = -34.5%
Formula
Percentage change = [(636 - 971) / 971] x 100
Subtract the new number by the original number
636 - 971 = -335
-335 ÷ 971 = -0.345005149330587
-0.345005149330587 x 100 = -34.5%