-30.09% is the change from 638 to 446
Calculation steps:
[( 446 - 638 ) ÷ 638] x 100 = -30.09%
Formula
Percentage change = [(446 - 638) / 638] x 100
Subtract the new number by the original number
446 - 638 = -192
-192 ÷ 638 = -0.30094043887147337
-0.30094043887147337 x 100 = -30.09%