-84.8% is the change from 638 to 97
Calculation steps:
[( 97 - 638 ) ÷ 638] x 100 = -84.8%
Formula
Percentage change = [(97 - 638) / 638] x 100
Subtract the new number by the original number
97 - 638 = -541
-541 ÷ 638 = -0.8479623824451411
-0.8479623824451411 x 100 = -84.8%