-84.17% is the change from 638 to 101
Calculation steps:
[( 101 - 638 ) ÷ 638] x 100 = -84.17%
Formula
Percentage change = [(101 - 638) / 638] x 100
Subtract the new number by the original number
101 - 638 = -537
-537 ÷ 638 = -0.841692789968652
-0.841692789968652 x 100 = -84.17%