-86.71% is the change from 677 to 90
Calculation steps:
[( 90 - 677 ) ÷ 677] x 100 = -86.71%
Formula
Percentage change = [(90 - 677) / 677] x 100
Subtract the new number by the original number
90 - 677 = -587
-587 ÷ 677 = -0.8670605612998523
-0.8670605612998523 x 100 = -86.71%