-85.57% is the change from 686 to 99
Calculation steps:
[( 99 - 686 ) ÷ 686] x 100 = -85.57%
Formula
Percentage change = [(99 - 686) / 686] x 100
Subtract the new number by the original number
99 - 686 = -587
-587 ÷ 686 = -0.8556851311953353
-0.8556851311953353 x 100 = -85.57%