-80.88% is the change from 638 to 122
Calculation steps:
[( 122 - 638 ) ÷ 638] x 100 = -80.88%
Formula
Percentage change = [(122 - 638) / 638] x 100
Subtract the new number by the original number
122 - 638 = -516
-516 ÷ 638 = -0.8087774294670846
-0.8087774294670846 x 100 = -80.88%