-69.57% is the change from 851 to 259
Calculation steps:
[( 259 - 851 ) ÷ 851] x 100 = -69.57%
Formula
Percentage change = [(259 - 851) / 851] x 100
Subtract the new number by the original number
259 - 851 = -592
-592 ÷ 851 = -0.6956521739130435
-0.6956521739130435 x 100 = -69.57%