-74.76% is the change from 638 to 161
Calculation steps:
[( 161 - 638 ) ÷ 638] x 100 = -74.76%
Formula
Percentage change = [(161 - 638) / 638] x 100
Subtract the new number by the original number
161 - 638 = -477
-477 ÷ 638 = -0.7476489028213166
-0.7476489028213166 x 100 = -74.76%