-85.55% is the change from 685 to 99
Calculation steps:
[( 99 - 685 ) ÷ 685] x 100 = -85.55%
Formula
Percentage change = [(99 - 685) / 685] x 100
Subtract the new number by the original number
99 - 685 = -586
-586 ÷ 685 = -0.8554744525547445
-0.8554744525547445 x 100 = -85.55%