-89.89% is the change from 851 to 86
Calculation steps:
[( 86 - 851 ) ÷ 851] x 100 = -89.89%
Formula
Percentage change = [(86 - 851) / 851] x 100
Subtract the new number by the original number
86 - 851 = -765
-765 ÷ 851 = -0.8989424206815512
-0.8989424206815512 x 100 = -89.89%