-19.72% is the change from 857 to 688
Calculation steps:
[( 688 - 857 ) ÷ 857] x 100 = -19.72%
Formula
Percentage change = [(688 - 857) / 857] x 100
Subtract the new number by the original number
688 - 857 = -169
-169 ÷ 857 = -0.1971995332555426
-0.1971995332555426 x 100 = -19.72%