-80.19% is the change from 838 to 166
Calculation steps:
[( 166 - 838 ) ÷ 838] x 100 = -80.19%
Formula
Percentage change = [(166 - 838) / 838] x 100
Subtract the new number by the original number
166 - 838 = -672
-672 ÷ 838 = -0.801909307875895
-0.801909307875895 x 100 = -80.19%