-62.47% is the change from 850 to 319
Calculation steps:
[( 319 - 850 ) ÷ 850] x 100 = -62.47%
Formula
Percentage change = [(319 - 850) / 850] x 100
Subtract the new number by the original number
319 - 850 = -531
-531 ÷ 850 = -0.6247058823529412
-0.6247058823529412 x 100 = -62.47%