-86.34% is the change from 637 to 87
Calculation steps:
[( 87 - 637 ) ÷ 637] x 100 = -86.34%
Formula
Percentage change = [(87 - 637) / 637] x 100
Subtract the new number by the original number
87 - 637 = -550
-550 ÷ 637 = -0.8634222919937206
-0.8634222919937206 x 100 = -86.34%