-78.06% is the change from 638 to 140
Calculation steps:
[( 140 - 638 ) ÷ 638] x 100 = -78.06%
Formula
Percentage change = [(140 - 638) / 638] x 100
Subtract the new number by the original number
140 - 638 = -498
-498 ÷ 638 = -0.780564263322884
-0.780564263322884 x 100 = -78.06%