-85.66% is the change from 851 to 122
Calculation steps:
[( 122 - 851 ) ÷ 851] x 100 = -85.66%
Formula
Percentage change = [(122 - 851) / 851] x 100
Subtract the new number by the original number
122 - 851 = -729
-729 ÷ 851 = -0.8566392479435958
-0.8566392479435958 x 100 = -85.66%