-28.68% is the change from 638 to 455
Calculation steps:
[( 455 - 638 ) ÷ 638] x 100 = -28.68%
Formula
Percentage change = [(455 - 638) / 638] x 100
Subtract the new number by the original number
455 - 638 = -183
-183 ÷ 638 = -0.28683385579937304
-0.28683385579937304 x 100 = -28.68%