-19.97% is the change from 686 to 549
Calculation steps:
[( 549 - 686 ) ÷ 686] x 100 = -19.97%
Formula
Percentage change = [(549 - 686) / 686] x 100
Subtract the new number by the original number
549 - 686 = -137
-137 ÷ 686 = -0.19970845481049562
-0.19970845481049562 x 100 = -19.97%