-87.03% is the change from 663 to 86
Calculation steps:
[( 86 - 663 ) ÷ 663] x 100 = -87.03%
Formula
Percentage change = [(86 - 663) / 663] x 100
Subtract the new number by the original number
86 - 663 = -577
-577 ÷ 663 = -0.8702865761689291
-0.8702865761689291 x 100 = -87.03%