-88.3% is the change from 684 to 80
Calculation steps:
[( 80 - 684 ) ÷ 684] x 100 = -88.3%
Formula
Percentage change = [(80 - 684) / 684] x 100
Subtract the new number by the original number
80 - 684 = -604
-604 ÷ 684 = -0.8830409356725146
-0.8830409356725146 x 100 = -88.3%