-86.9% is the change from 687 to 90
Calculation steps:
[( 90 - 687 ) ÷ 687] x 100 = -86.9%
Formula
Percentage change = [(90 - 687) / 687] x 100
Subtract the new number by the original number
90 - 687 = -597
-597 ÷ 687 = -0.868995633187773
-0.868995633187773 x 100 = -86.9%