-87.61% is the change from 686 to 85
Calculation steps:
[( 85 - 686 ) ÷ 686] x 100 = -87.61%
Formula
Percentage change = [(85 - 686) / 686] x 100
Subtract the new number by the original number
85 - 686 = -601
-601 ÷ 686 = -0.8760932944606414
-0.8760932944606414 x 100 = -87.61%