-86.69% is the change from 661 to 88
Calculation steps:
[( 88 - 661 ) ÷ 661] x 100 = -86.69%
Formula
Percentage change = [(88 - 661) / 661] x 100
Subtract the new number by the original number
88 - 661 = -573
-573 ÷ 661 = -0.8668683812405447
-0.8668683812405447 x 100 = -86.69%