-71.79% is the change from 638 to 180
Calculation steps:
[( 180 - 638 ) ÷ 638] x 100 = -71.79%
Formula
Percentage change = [(180 - 638) / 638] x 100
Subtract the new number by the original number
180 - 638 = -458
-458 ÷ 638 = -0.7178683385579937
-0.7178683385579937 x 100 = -71.79%