-86.5% is the change from 637 to 86
Calculation steps:
[( 86 - 637 ) ÷ 637] x 100 = -86.5%
Formula
Percentage change = [(86 - 637) / 637] x 100
Subtract the new number by the original number
86 - 637 = -551
-551 ÷ 637 = -0.8649921507064364
-0.8649921507064364 x 100 = -86.5%