-90.64% is the change from 673 to 63
Calculation steps:
[( 63 - 673 ) ÷ 673] x 100 = -90.64%
Formula
Percentage change = [(63 - 673) / 673] x 100
Subtract the new number by the original number
63 - 673 = -610
-610 ÷ 673 = -0.9063893016344725
-0.9063893016344725 x 100 = -90.64%