-86.86% is the change from 685 to 90
Calculation steps:
[( 90 - 685 ) ÷ 685] x 100 = -86.86%
Formula
Percentage change = [(90 - 685) / 685] x 100
Subtract the new number by the original number
90 - 685 = -595
-595 ÷ 685 = -0.8686131386861314
-0.8686131386861314 x 100 = -86.86%