-75.27% is the change from 639 to 158
Calculation steps:
[( 158 - 639 ) ÷ 639] x 100 = -75.27%
Formula
Percentage change = [(158 - 639) / 639] x 100
Subtract the new number by the original number
158 - 639 = -481
-481 ÷ 639 = -0.7527386541471048
-0.7527386541471048 x 100 = -75.27%