-19.85% is the change from 685 to 549
Calculation steps:
[( 549 - 685 ) ÷ 685] x 100 = -19.85%
Formula
Percentage change = [(549 - 685) / 685] x 100
Subtract the new number by the original number
549 - 685 = -136
-136 ÷ 685 = -0.19854014598540146
-0.19854014598540146 x 100 = -19.85%