-87.52% is the change from 673 to 84
Calculation steps:
[( 84 - 673 ) ÷ 673] x 100 = -87.52%
Formula
Percentage change = [(84 - 673) / 673] x 100
Subtract the new number by the original number
84 - 673 = -589
-589 ÷ 673 = -0.87518573551263
-0.87518573551263 x 100 = -87.52%