-84.02% is the change from 851 to 136
Calculation steps:
[( 136 - 851 ) ÷ 851] x 100 = -84.02%
Formula
Percentage change = [(136 - 851) / 851] x 100
Subtract the new number by the original number
136 - 851 = -715
-715 ÷ 851 = -0.8401880141010576
-0.8401880141010576 x 100 = -84.02%