-38.94% is the change from 850 to 519
Calculation steps:
[( 519 - 850 ) ÷ 850] x 100 = -38.94%
Formula
Percentage change = [(519 - 850) / 850] x 100
Subtract the new number by the original number
519 - 850 = -331
-331 ÷ 850 = -0.38941176470588235
-0.38941176470588235 x 100 = -38.94%