-86.36% is the change from 638 to 87
Calculation steps:
[( 87 - 638 ) ÷ 638] x 100 = -86.36%
Formula
Percentage change = [(87 - 638) / 638] x 100
Subtract the new number by the original number
87 - 638 = -551
-551 ÷ 638 = -0.8636363636363636
-0.8636363636363636 x 100 = -86.36%