-80.31% is the change from 843 to 166
Calculation steps:
[( 166 - 843 ) ÷ 843] x 100 = -80.31%
Formula
Percentage change = [(166 - 843) / 843] x 100
Subtract the new number by the original number
166 - 843 = -677
-677 ÷ 843 = -0.8030842230130486
-0.8030842230130486 x 100 = -80.31%