-83.2% is the change from 851 to 143
Calculation steps:
[( 143 - 851 ) ÷ 851] x 100 = -83.2%
Formula
Percentage change = [(143 - 851) / 851] x 100
Subtract the new number by the original number
143 - 851 = -708
-708 ÷ 851 = -0.8319623971797885
-0.8319623971797885 x 100 = -83.2%