-25.67% is the change from 857 to 637
Calculation steps:
[( 637 - 857 ) ÷ 857] x 100 = -25.67%
Formula
Percentage change = [(637 - 857) / 857] x 100
Subtract the new number by the original number
637 - 857 = -220
-220 ÷ 857 = -0.25670945157526254
-0.25670945157526254 x 100 = -25.67%