-39.09% is the change from 857 to 522
Calculation steps:
[( 522 - 857 ) ÷ 857] x 100 = -39.09%
Formula
Percentage change = [(522 - 857) / 857] x 100
Subtract the new number by the original number
522 - 857 = -335
-335 ÷ 857 = -0.3908984830805134
-0.3908984830805134 x 100 = -39.09%