-20.09% is the change from 861 to 688
Calculation steps:
[( 688 - 861 ) ÷ 861] x 100 = -20.09%
Formula
Percentage change = [(688 - 861) / 861] x 100
Subtract the new number by the original number
688 - 861 = -173
-173 ÷ 861 = -0.20092915214866433
-0.20092915214866433 x 100 = -20.09%