-82.58% is the change from 821 to 143
Calculation steps:
[( 143 - 821 ) ÷ 821] x 100 = -82.58%
Formula
Percentage change = [(143 - 821) / 821] x 100
Subtract the new number by the original number
143 - 821 = -678
-678 ÷ 821 = -0.8258221680876979
-0.8258221680876979 x 100 = -82.58%