-19.65% is the change from 636 to 511
Calculation steps:
[( 511 - 636 ) ÷ 636] x 100 = -19.65%
Formula
Percentage change = [(511 - 636) / 636] x 100
Subtract the new number by the original number
511 - 636 = -125
-125 ÷ 636 = -0.19654088050314467
-0.19654088050314467 x 100 = -19.65%