-83.31% is the change from 851 to 142
Calculation steps:
[( 142 - 851 ) ÷ 851] x 100 = -83.31%
Formula
Percentage change = [(142 - 851) / 851] x 100
Subtract the new number by the original number
142 - 851 = -709
-709 ÷ 851 = -0.8331374853113983
-0.8331374853113983 x 100 = -83.31%