-78.08% is the change from 634 to 139
Calculation steps:
[( 139 - 634 ) ÷ 634] x 100 = -78.08%
Formula
Percentage change = [(139 - 634) / 634] x 100
Subtract the new number by the original number
139 - 634 = -495
-495 ÷ 634 = -0.7807570977917981
-0.7807570977917981 x 100 = -78.08%