-20.2% is the change from 688 to 549
Calculation steps:
[( 549 - 688 ) ÷ 688] x 100 = -20.2%
Formula
Percentage change = [(549 - 688) / 688] x 100
Subtract the new number by the original number
549 - 688 = -139
-139 ÷ 688 = -0.20203488372093023
-0.20203488372093023 x 100 = -20.2%