-83.29% is the change from 820 to 137
Calculation steps:
[( 137 - 820 ) ÷ 820] x 100 = -83.29%
Formula
Percentage change = [(137 - 820) / 820] x 100
Subtract the new number by the original number
137 - 820 = -683
-683 ÷ 820 = -0.8329268292682926
-0.8329268292682926 x 100 = -83.29%