-84.01% is the change from 638 to 102
Calculation steps:
[( 102 - 638 ) ÷ 638] x 100 = -84.01%
Formula
Percentage change = [(102 - 638) / 638] x 100
Subtract the new number by the original number
102 - 638 = -536
-536 ÷ 638 = -0.8401253918495298
-0.8401253918495298 x 100 = -84.01%