-87.37% is the change from 673 to 85
Calculation steps:
[( 85 - 673 ) ÷ 673] x 100 = -87.37%
Formula
Percentage change = [(85 - 673) / 673] x 100
Subtract the new number by the original number
85 - 673 = -588
-588 ÷ 673 = -0.8736998514115899
-0.8736998514115899 x 100 = -87.37%