-86.64% is the change from 666 to 89
Calculation steps:
[( 89 - 666 ) ÷ 666] x 100 = -86.64%
Formula
Percentage change = [(89 - 666) / 666] x 100
Subtract the new number by the original number
89 - 666 = -577
-577 ÷ 666 = -0.8663663663663663
-0.8663663663663663 x 100 = -86.64%