-85.1% is the change from 819 to 122
Calculation steps:
[( 122 - 819 ) ÷ 819] x 100 = -85.1%
Formula
Percentage change = [(122 - 819) / 819] x 100
Subtract the new number by the original number
122 - 819 = -697
-697 ÷ 819 = -0.851037851037851
-0.851037851037851 x 100 = -85.1%