-82.56% is the change from 820 to 143
Calculation steps:
[( 143 - 820 ) ÷ 820] x 100 = -82.56%
Formula
Percentage change = [(143 - 820) / 820] x 100
Subtract the new number by the original number
143 - 820 = -677
-677 ÷ 820 = -0.8256097560975609
-0.8256097560975609 x 100 = -82.56%