-88.56% is the change from 638 to 73
Calculation steps:
[( 73 - 638 ) ÷ 638] x 100 = -88.56%
Formula
Percentage change = [(73 - 638) / 638] x 100
Subtract the new number by the original number
73 - 638 = -565
-565 ÷ 638 = -0.8855799373040752
-0.8855799373040752 x 100 = -88.56%