-39.48% is the change from 851 to 515
Calculation steps:
[( 515 - 851 ) ÷ 851] x 100 = -39.48%
Formula
Percentage change = [(515 - 851) / 851] x 100
Subtract the new number by the original number
515 - 851 = -336
-336 ÷ 851 = -0.39482961222091656
-0.39482961222091656 x 100 = -39.48%