-87.79% is the change from 688 to 84
Calculation steps:
[( 84 - 688 ) ÷ 688] x 100 = -87.79%
Formula
Percentage change = [(84 - 688) / 688] x 100
Subtract the new number by the original number
84 - 688 = -604
-604 ÷ 688 = -0.877906976744186
-0.877906976744186 x 100 = -87.79%