-86.63% is the change from 673 to 90
Calculation steps:
[( 90 - 673 ) ÷ 673] x 100 = -86.63%
Formula
Percentage change = [(90 - 673) / 673] x 100
Subtract the new number by the original number
90 - 673 = -583
-583 ÷ 673 = -0.8662704309063893
-0.8662704309063893 x 100 = -86.63%