-70.85% is the change from 638 to 186
Calculation steps:
[( 186 - 638 ) ÷ 638] x 100 = -70.85%
Formula
Percentage change = [(186 - 638) / 638] x 100
Subtract the new number by the original number
186 - 638 = -452
-452 ÷ 638 = -0.7084639498432602
-0.7084639498432602 x 100 = -70.85%