-82.79% is the change from 831 to 143
Calculation steps:
[( 143 - 831 ) ÷ 831] x 100 = -82.79%
Formula
Percentage change = [(143 - 831) / 831] x 100
Subtract the new number by the original number
143 - 831 = -688
-688 ÷ 831 = -0.8279181708784596
-0.8279181708784596 x 100 = -82.79%