-87.43% is the change from 684 to 86
Calculation steps:
[( 86 - 684 ) ÷ 684] x 100 = -87.43%
Formula
Percentage change = [(86 - 684) / 684] x 100
Subtract the new number by the original number
86 - 684 = -598
-598 ÷ 684 = -0.8742690058479532
-0.8742690058479532 x 100 = -87.43%