-82.84% is the change from 810 to 139
Calculation steps:
[( 139 - 810 ) ÷ 810] x 100 = -82.84%
Formula
Percentage change = [(139 - 810) / 810] x 100
Subtract the new number by the original number
139 - 810 = -671
-671 ÷ 810 = -0.828395061728395
-0.828395061728395 x 100 = -82.84%