-20.75% is the change from 636 to 504
Calculation steps:
[( 504 - 636 ) ÷ 636] x 100 = -20.75%
Formula
Percentage change = [(504 - 636) / 636] x 100
Subtract the new number by the original number
504 - 636 = -132
-132 ÷ 636 = -0.20754716981132076
-0.20754716981132076 x 100 = -20.75%