-15.89% is the change from 686 to 577
Calculation steps:
[( 577 - 686 ) ÷ 686] x 100 = -15.89%
Formula
Percentage change = [(577 - 686) / 686] x 100
Subtract the new number by the original number
577 - 686 = -109
-109 ÷ 686 = -0.1588921282798834
-0.1588921282798834 x 100 = -15.89%